7.NS.1

Apply and extend previous understandings of addition and subtraction to add and subtract rational numbers; represent addition and subtraction on a horizontal or vertical number line diagram.

1.		0.1 less, 0.1 more than 82
2.		0.1 less, 0.1 more than 99
3.		0.1 less, 0.1 more than 99.9
4.		Number Detectives: 2 prime numbers-sum =1 more than 8 squared
5.		Add board: 183+30=2*60
6.		Add Board: Complete vertical algorithm
7.		Add Board: Complete vertical algorithm
8.		Add Board: Complete vertical algorithm
9.		Add Board: Complete vertical algorithm
10.		Hundreds and Hundreds: Complete vertical algorithm
11.		Hundreds and Hundreds: Complete vertical algorithm
12.		Add it up: 2,969+852
13.		Add it up: 3,268+852
14.		Add it up: 2,959+356
15.		Add it up: 5,478+852
16.		Add it up: 5,478+852
17.		Thousands and Thousands: Complete vertical algorithm
18.		Thousands and Thousands: Complete vertical algorithm
19.		Thousands and Thousands: Complete vertical algorithm
20.		Thousands and Thousands: Complete vertical algorithm
21.		Thousands and Thousands: Complete vertical algorithm
22.		Add It Up: Addition of 4-digit numbers with regrouping
23.		Add It Up: Addition of 4-digit numbers with regrouping
24.		Add It Up: Addition of 4-digit numbers with regrouping
25.		Add It Up: Addition of 4-digit numbers with regrouping
26.		Add It Up: Addition of 4-digit numbers with regrouping
27.		Add It Up: Addition of 4-digit numbers with regrouping
28.		Add It Up: Addition of 4-digit numbers with regrouping
29.		Add It Up: Addition of 4-digit numbers with regrouping
30.		Add It Up: Addition of 4-digit numbers with regrouping
31.		Add It Up: Addition of 4-digit numbers with regrouping
32.		Add board: Write missing numbers in vertical addition of 2- and 3-digit numbers
33.		Add board: Write missing numbers in vertical addition of 2- and 3-digit numbers
34.		Add board: Write missing numbers in vertical addition of 2- and 3-digit numbers
35.		Add board: Write missing numbers in vertical addition of 2- and 3-digit numbers
36.		Add board: Write missing numbers in vertical addition of 2- and 3-digit numbers
37.		Add board: Write missing numbers in vertical addition of 2- and 3-digit numbers
38.		Same or different : Click all the boxes with the same answer.
39.		Same or different : Click all the boxes with the same answer.
40.		Same or different : Click all the boxes with the same answer.
41.		Same or different : Click all the boxes with the same answer.
42.		Same or different : Click all the boxes with the same answer.
43.		Add it up 4126+5999
44.		Add it up 5672+6928
45.		Add it up 2369+9872
46.		Add it up 8273+7989
47.		Add it up 7827+6376
48.		Add these three numbers 24+45+16=?
49.		Add these three numbers 20+35+16=?
50.		Add these three numbers 45+15+14=?
51.		Add these three numbers 26+12+22=?
52.		Add these three numbers 37+13+18=?
53.		Number detectives: Four's no chore - Add 4 clustered numbers
54.		Number detectives: Four's no chore - Add 4 clustered numbers
55.		Number detectives: Four's no chore - Add 4 clustered numbers
56.		Number detectives: Four's no chore - Add 4 clustered numbers
57.		Number detectives: Four's no chore - Add 4 clustered numbers
58.		Changing numbers 2.351 add 0.3, 0.003, 0.03
59.		Changing numbers 5.391 add 4, 0.004, 0.4
60.		Changing numbers 4.345 add 0.004, 40, 0.04
61.		Changing numbers 1.221 Add 0.7, 0.07, 7.007
62.		Changing numbers 3.539 add 0.001, 1.1, 1.01
63.		Same or different: Click all the boxes with the same answer
64.		Same or different: Click all the boxes with the same answer
65.		Same or different: Click all the boxes with the same answer
66.		Same or different: Click all the boxes with the same answer
67.		Same or different: Click all the boxes with the same answer
68.		Make 150 70+44+*
69.		Make 120 52+37+*
70.		Make 140 96+14+*
71.		Make 130 75+41+*
72.		Make 160 57+33+*
73.		Number detectives: Add 4 clustered tens numbers
74.		Number detectives: Add 4 clustered tens numbers
75.		Number detectives: Add 4 clustered tens numbers
76.		Number detectives: Add 4 clustered tens numbers
77.		Number detectives: Add 4 clustered tens numbers
78.		Scoring decimal points: Write the missing numbers in vertical decimal addition
79.		Scoring decimal points: Write the missing numbers in vertical decimal addition
80.		Scoring decimal points: Write the missing numbers in vertical decimal addition
81.		Scoring decimal points: Write the missing numbers in vertical decimal addition
82.		Scoring decimal points: Write the missing numbers in vertical decimal addition
83.		Hundredths crossing: Add/subtract crossing a tenths/whole number bound
84.		Hundredths crossing: Add/subtract crossing a tenths/whole number bound
85.		Hundredths crossing: Add/subtract crossing a tenths/whole number bound
86.		Hundredths crossing: Add/subtract crossing a tenths/whole number bound
87.		Hundredths crossing: Add/subtract crossing a tenths/whole number bound
88.		Adding the big ones: Write the missing numbers in vertical addition of large whole numbers
89.		Adding the big ones: Write the missing numbers in vertical addition of large whole numbers
90.		Adding the big ones: Write the missing numbers in vertical addition of large whole numbers
91.		Adding the big ones: Write the missing numbers in vertical addition of large whole numbers
92.		Adding the big ones: Write the missing numbers in vertical addition of large whole numbers
93.		Changing numbers: Addition/subtraction using negative integers
94.		Changing numbers: Addition/subtraction using negative integers
95.		Changing numbers: Addition/subtraction using negative integers
96.		Changing numbers: Addition/subtraction using negative integers
97.		Changing numbers: Addition/subtraction using negative integers
98.		Make 20 13+-6+*
99.		Make 15 3+19+*
100.		Make 10 8+7+*
101.		Make 20 8+-2+*
102.		Make 15 21+-6+*
103.		Add these three numbers: 13+-7+3
104.		Add these three numbers: 9+2+-3
105.		Add these three numbers: 9+8+-5
106.		Add these three numbers: 16+-9+2
107.		Add these three numbers: 20+-9+11
108.		Number detectives: Add 4 clustered hundreds numbers
109.		Number detectives: Add 4 clustered hundreds numbers
110.		Number detectives: Add 4 clustered hundreds numbers
111.		Number detectives: Add 4 clustered hundreds numbers
112.		Number detectives: Add 4 clustered hundreds numbers
113.		Adding the big ones: Write missing numbers in vertical addition
114.		Adding the big ones: Write missing numbers in vertical addition
115.		Adding the big ones: Write missing numbers in vertical addition
116.		Adding the big ones: Write missing numbers in vertical addition
117.		Adding the big ones: Write missing numbers in vertical addition
118.		In the swim: Addition of times
119.		And a Partridge in a pear tree 12+11+10+9, etc
120.		Make 13 18+34+*
121.		Make -5 27+9+*
122.		Make 29 37+20+*
123.		Make -8 42+16+*
124.		Make 32 29+12+*
125.		Detective Duck: Add 4 clustered numbers
126.		Detective Duck: Add 4 clustered numbers
127.		Detective Duck: Add 4 clustered numbers
128.		Detective Duck: Add 4 clustered numbers
129.		Detective Duck: Add 4 clustered numbers
130.		Hundredths crossing: Addition of numbers with 2 dec places
131.		Hundredths crossing: Addition of numbers with 2 dec places
132.		Adding the big ones: Write missing numbers in vertical additions
133.		Adding the big ones: Write missing numbers in vertical additions
134.		Adding the big ones: Write missing numbers in vertical additions
135.		Adding the big ones: Write missing numbers in vertical additions
136.		Adding the big ones: Write missing numbers in vertical additions
137.		In the swim - Superfish v. Torpedos
138.		Make 29: 282 + -184 + *
139.		Make 180: 369 + -75 + *
140.		Make 126: 34+81 + *
141.		Make 79: 104 + -53 + *
142.		Make 115: -26 + 180 + *
143.		Add 3 numbers: 106 + 24 + -6
144.		Add 3 numbers: -72 + 203 + -16
145.		Add 3 numbers: -58 + -245 + 10
146.		Add 3 numbers: -158 + 101 + 69
147.		Add 3 numbers: -36 + -72 + 17
148.		Four's no chore: Add 4 clustered numbers
149.		Four's no chore: Add 4 clustered numbers
150.		Four's no chore: Add 4 clustered numbers
151.		Four's no chore: Add 4 clustered numbers
152.		Four's no chore: Add 4 clustered numbers
153.		Hundredths crossing: Addition of numbers with 2 dp
154.		Hundredths crossing: Addition of numbers with 2 dp
155.		Adding the big ones: Write missing numbers in vertical addition
156.		Adding the big ones: Write missing numbers in vertical addition
157.		Adding the big ones: Write missing numbers in vertical addition
158.		Adding the big ones: Write missing numbers in vertical addition
159.		Adding the big ones: Write missing numbers in vertical addition
160.		Hundreds and Thousands: 5* - *90=1890
161.		Jamie's Day Out - $100-$59-$27-$4-$8=$2
162.		Same or different: Click all boxes with the answer 126
163.		Same or different: Click all boxes with the answer 175
164.		Same or different: Click all boxes with the answer 426
165.		Same or different: Click all boxes with the answer 146
166.		Same or different: Click all boxes with the answer 236
167.		Same or different: Click all boxes with the answer 567
168.		Same or different: Click all boxes with the answer 194
169.		Same or different: Click all boxes with the answer 222
170.		Same or different: Click all boxes with the answer 468
171.		Same or different: Click all boxes with the answer 673
172.		Same or different: Click all boxes with the same answer
173.		Same or different: Click all boxes with the same answer
174.		Same or different: Click all boxes with the same answer
175.		Same or different: Click all boxes with the same answer
176.		Same or different: Click all boxes with the same answer
177.		Spot the difference: Write the difference between 612 and 588
178.		Spot the difference: Write the difference between 315 and 291
179.		Spot the difference: Write the difference between 708 and 687
180.		Spot the difference: Write the difference between 475 and 395
181.		Spot the difference: Write the difference between 117 and 95
182.		Same or Different - Click all the boxes where the answer is 84
183.		Same or Different - Click all the boxes where the answer is 387
184.		Same or Different - Click all the boxes where the answer is 792
185.		Same or Different - Click all the boxes where the answer is 576
186.		Same or Different - Click all the boxes where the answer is 264
187.		Taking the Big Ones: Write the missing numbers in vertical subtraction algorithms
188.		Taking the Big Ones: Write the missing numbers in vertical subtraction algorithms
189.		Taking the Big Ones: Write the missing numbers in vertical subtractions
190.		Taking the Big Ones: Write the missing numbers in vertical subtraction algorithms
191.		Taking the Big Ones: Write the missing numbers in vertical subtractions
192.		Decimal Drops: Write the missing numbers in vertical decimal subtractions
193.		Decimal Drops: Write the missing numbers in vertical decimal subtractions
194.		Decimal Drops: Write the missing numbers in vertical decimal subtractions
195.		Decimal Drops: Write the missing numbers in vertical decimal subtractions
196.		Decimal Drops: Write the missing numbers in vertical decimal subtractions
197.		Same or different: Click all the boxes with the same answer
198.		Same or different: Click all the boxes with the same answer
199.		Same or different: Click all the boxes with the same answer
200.		Same or different: Click all the boxes with the same answer
201.		Taking the Big Ones: Write the missing numbers in vertical subtraction algorithms
202.		Taking the Big Ones: Write the missing numbers in vertical subtraction algorithms
203.		Taking the Big Ones: Write the missing numbers in vertical subtraction algorithms
204.		Taking the Big Ones: Write the missing numbers in vertical subtraction algorithms
205.		Taking the Big Ones: Write the missing numbers in vertical subtraction algorithms
206.		Negatively speaking: -2 +(-4) - * = 10
207.		Negatively speaking: - 4 + 5 - * = 10
208.		Negatively speaking: -8 +7 - * = 10
209.		Negatively speaking: -6 - 1 - * = 10
210.		Negatively speaking: -16 +25 - * = 10
211.		Scoring decimal points: Write missing numbers in vertical subtractions
212.		Scoring decimal points: Write missing numbers in vertical subtractions
213.		Scoring decimal points: Write missing numbers in vertical subtractions
214.		Subtracting big ones: Write missing numbers in vertical subtractions
215.		Subtracting big ones: Write missing numbers in vertical subtractions
216.		Subtracting big ones: Write missing numbers in vertical subtractions
217.		Subtracting big ones: Write missing numbers in vertical subtractions
218.		Subtracting big ones: Write missing numbers in vertical subtractions
219.		Spot the Difference: Decimal subtraction calculation 2dp
220.		Spot the Difference: Decimal subtraction calculation 2dp
221.		Spot the Difference: Decimal subtraction calculation 2dp
222.		Write the missing number: 20= -10, 17, ?
223.		Write the missing number: 20=-45, 30, ?
224.		Write the missing number: 20= -15, 25, ?
225.		Write the missing number: 20= -18, -24, ?
226.		Write the missing number: 20= -8, -2, ?
227.		Same or Different: Click all the boxes where the answer is <1
228.		Same or Different: Click all the boxes where the answer is <1
229.		Same or Different: Click all the boxes where the answer is <1
230.		Same or Different: Click all the boxes where the answer is <1
231.		Same or Different: Click all the boxes where the answer is <1
232.		Put a number on the yellow box -41.5+23.7+ * =-14.4
233.		Put a number on the yellow box -26.7+-15.9+ * =-17.5
234.		Put a number on the yellow box -17.6+-11.9+ * =26.2
235.		Put a number on the yellow box -10.5+-18.9+ * =12.8
236.		Time travels: Calculate dates BC
237.		Spot the Difference: Calculate the difference between number pairs incl negative integers
238.		Spot the Difference: Calculate the difference between number pairs incl negative integers
239.		Spot the Difference: Calculate the difference between number pairs incl negative integers
240.		Spot the Difference: Calculate the difference between number pairs incl negative integers
241.		Take it away: Subtraction with decomposition
242.		Take it away: Subtraction with decomposition
243.		Take it away: Subtraction with decomposition
244.		Scoring Decimal Points: Write missing numbers in vertical subtraction
245.		Scoring Decimal Points: Write missing numbers in vertical subtraction
246.		Scoring Decimal Points: Write missing numbers in vertical subtraction
247.		Scoring Decimal Points: Write missing numbers in vertical subtraction
248.		Scoring Decimal Points: Write missing numbers in vertical subtraction
249.		Head Hunt - number problem
250.		The People On The Bus - number problem
251.		Al's Mass Mechanics - adding masses in kg and g, 3 decimal places
252.		Up and Up: 797.9+88.4=?
253.		Up and Up: 892.4+419.8=?
254.		Up and Up: 466.5+577.6=?
255.		Up and Up: 457.9+124.8=?
256.		Up and Up: 128.7+39.6=?
257.		Up and Up: 29.4+63.8
258.		Decimal Descent: 68.4-27.6
259.		Decimal Descent: 85.5-41.1
260.		10 less, 1000 more than 8 254 146
261.		1000 less, 1000 more than 6 325 478
262.		1000 less, 100 more than 2 135 698
263.		10 000 less, 100 000 more than 9 654 128
264.		1000 less, 1000 more than 6 598 696
265.		10 000 less, 1000 more than 9 630 258
266.		Hundreds Takeout: 792 -6 = 5*8
267.		Hundreds Takeout: 777 - 699 = *78
268.		1,000s crossing: 6,010-5,995, 8,012-7,990, 4,023-3,998
269.		1,000s crossing: 8,016-7,991, 7,004-6,987, 9,020-8,995
270.		Thousands Takeout: 618 - 42* =*219
271.		Thousands Takeout: 47 - 2859 = 5**4
272.		1,000s crossing: 2,002-1,999, 9,015-8,990, 5,011-4,991
273.		1,000s crossing: 3,021-2,988, 6,017-5,996, 2,008-1,994
274.		1,000s crossing: 4,011-3,994, 5,009-4,989, 7,013-6,990
275.		Give or take a thousand: 136,558+9,000
276.		Give or Take 1,000: 155,000 - 4,000 = ?
277.		Give or take a thousand: 4,000 more than 13,468
278.		Give or take a thousand: 3,000 more than 21,654
279.		Give or Take Thousands: 19,000 less than 49,000
280.		Sleep on it: $134-$79=$?
281.		1,000s crossing: 4,020-3,990, 7,005-6,985, 3,009-2,999
282.		1,000s crossing: 2,030-1,980, 4,040-3,960, 6,010-5,970
283.		1,000s crossing: 1,050-980, 2,020-1,970, 5,070-4,990
284.		Uncle Max's New Car - $7,845-$3,250
285.		Thousands Takeout: Complete vertical algorithm
286.		Thousands Takeout: Complete vertical algorithm
287.		Thousands Takeout: Complete vertical algorithm
288.		Thousands Takeout: Complete vertical algorithm
289.		Shannon's Day Out - $25-$3-$11-$6-$4=$1
290.		Give or Take Thousands: 155,000 - 2,000
291.		Give or Take Thousands: 222,000 - 22,000
292.		Give or Take Thousands: Take 39,000 from 49,000
293.		Give or Take 1,000: how much more 590,000 than 290,000
294.		Give or take a thousand: 7,000 more than 63,489
295.		Give or take a thousand: 8,000 more than 49,735
296.		Thousands Takeout: Complete vertical algorithm
297.		Thousands Takeout: Complete vertical algorithm
298.		Thousands Takeout: Complete vertical algorithm
299.		Thousands Takeout: Complete vertical algorithm
300.		Thousands Takeout: Complete vertical algorithm
301.		1,000s crossing: 8,020-7,940, 4,030-3,950, 9,060-8,980
302.		1,000s crossing: 5,030-4,990, 3,010-2,950, 7,970-8,040
303.		1,000s Crossing: 6,015-5,999, 8,014-7,995, 3,024-2,990
304.		Give or take a thousand: 283,557+4,000
305.		Give or take a thousand: 7,000 more than 456,821
306.		Give or take a thousand: Add 8,000 and 197,523
307.		Give or take a thousand: Sum of 7,000 and 197,237
308.		Give or take a thousand: Sum of 128,764 and 6,000
309.		Give or take a thousand: 164,849 more than 7,000
310.		Give or take a thousand: 345,219 greater than 7,000
311.		Give or take a thousand: Sum of 349,285 and 4,000
312.		Give or take a thousand: Add 319,564 to 3,000
313.		Give or Take Thousands: 260,000 - 5,000
314.		Give or Take 1,000: 1,280,000 - 4,000 = 1,276,000
315.		Give or Take Thousands: 22,000 - 3,000
316.		Give or Take Thousands: 24,000 - 6,000
317.		Give or Take Thousands: 15,500 - 2,000
318.		Give or Take Thousands: 12,000 - 1,200
319.		Fiona's day out
320.		Thousands crossing: 12,009-12, 16,005-9, 25,006-15
321.		Thousands crossing: 24,001-6, 27,004-10, 23,002-22,987
322.		Thousands crossing: 22,002-10, 19,006-8, 41,009-15
323.		Thousands crossing: 42,002-41,992, 26,013-25,287, 37,007-15
324.		Give or Take a thousand
325.		Give or Take a thousand
326.		Give or Take a thousand
327.		Give or Take a thousand
328.		Give or Take a thousand
329.		Changing numbers: 36,925 add 10 add 1,000 add 1
330.		Changing numbers: 23,615 add 1,000 add 100 add 10
331.		Changing numbers: 36,052 add 1,000 add 1 add 10
332.		Changing numbers: 23,855 add 100 add 1 add 10
333.		Changing numbers: 36,159 add 100 add 1 add 10
334.		Thousands Takeout: Write missing numbers in vertical subtraction of thousands numbers
335.		Thousands Takeout: Write missing numbers in vertical subtraction of thousands numbers
336.		Thousands Takeout: Write missing numbers in vertical subtraction of thousands numbers
337.		Thousands Takeout: Write missing numbers in vertical subtraction of thousands numbers
338.		Thousands Takeout: Write missing numbers in vertical subtraction of thousands numbers
339.		Lord Percibald rides in style: New price less trade-in
340.		Dr Dan drives on: New price less trade-in
341.		Mitchell moves up: New price less trade-in
342.		Wheeling Deal: New price less trade-in
343.		Uncle Bob's new car: New price less trade-in
344.		Give or take a thousand what is 19,369 + 3,000?
345.		Give or take a thousand what is 6,000 m/t 8,331?
346.		Give or take a thousand what is 5,000 m/t 23,669?
347.		Give or take a thousand Add 8,000 to 7,558
348.		Give or take a thousand Add 4,000 to 2,668
349.		Thousands Takeout: 34 - 2375 = 5**8
350.		Thousands Takeout: 673* - *41 = 399
351.		Thousands Takeout: 42 - 4480 = 4**5
352.		The Birds and the Bears - Subtraction of measurements in inches
353.		Cheetin' Horses: Comparison of speeds in mph
354.		Having A Field Day: Money addition and subtraction
355.		Thirsty work: Comparison of volumes
356.		Thousands Takeout: 70** - 104 = 199
357.		Thousands Takeout: 04 - 279 = 121
358.		All around the garden: Addition and subtraction of distance measurements
359.		Give or Take a Thousand 142,301 - 6,000 = ?
360.		Give or Take a Thousand 335,771 - 8,000 = ?
361.		Give or Take a Thousand 1,524,151 - 20,000 = ?
362.		Give or Take a Thousand 1,348,159 - 10,000 = ?
363.		Give or Take a Thousand 31,486,128 - 30,000 = ?
364.		Give or Take a Thousand 13,221 - 8,000 = ?
365.		Give or Take a Thousand 12,850 - 4,000 = ?
366.		Give or Take a Thousand 31,280 - 3,000 = ?
367.		Give or Take a Thousand 25,190 - 6,000 = ?
368.		Give or Take a Thousand 14,820 - 7,000 = ?
369.		Give or Take a Thousand 193,051 - 3,000 = ?
370.		Give or Take a Thousand 714,320 - 5,000 = ?
371.		Give or Take a Thousand 685,531 - 2,000 = ?
372.		Give or Take a Thousand 214,990 - 5,000 = ?
373.		Give or Take a Thousand 33,750 - 3,000 = ?
374.		Give or Take 10,000 50,000+50,332
375.		Give or Take 10,000 20,000 + 239,330
376.		Give or Take 10,000 40,000+56,780
377.		Give or Take 10,000 50,000+23,565
378.		Give or Take 10,000 40,000+227,558
379.		Give or Take a Hundred 562,719-500
380.		Give or Take a Hundred 276,582-400
381.		Give or Take a Hundred 618,395-200
382.		Give or Take a Hundred 45,927-300
383.		Give or Take a Hundred 75,881-700
384.		Driven to the edge: 1,000-793
385.		Growing pains - 1,000-126
386.		Pump up the volume - 3,000-934
387.		Taking stock - 1000-750
388.		Thousands crossing: Add/subtract crossing a thousands bound
389.		Thousands crossing: Add/subtract crossing a thousands bound
390.		Thousands crossing: Add/subtract crossing a thousands bound
391.		Thousands crossing: Add/subtract crossing a thousands bound
392.		Thousands crossing: Add/subtract crossing a thousands bound
393.		Spot the difference: 3,150 - 1,500
394.		Spot the difference: 8,400 - 3,500
395.		Spot the difference: 2,600 - 8,700
396.		Spot the difference: 9,350 - 5,450
397.		Spot the difference: 5,750 - 2,550
398.		Spot the difference: 6,600 - 3,650
399.		Spot the difference: 4,550 - 2,150
400.		Give or take a thousand: 842,908 - 74,000
401.		Give or take a thousand: 13,553 - 8,000
402.		Give or take a thousand: 86,215 - 7,000
403.		Give or take a thousand: 120,068 - 88,068
404.		Give or take a thousand: 262,141 - 245,141
405.		Give or take a thousand: 182,356 - 127,356
406.		Give or take a thousand: 236,401 - 195,401
407.		Give or take a thousand: 106,095 - 29,000
408.		Give or take a thousand: 135,001 - 34,000
409.		Give or take a thousand: 257,908 - 160,000
410.		Same or different: Click all the boxes with the same answer
411.		Plumbing the depths: Calculate in feet
412.		Spot the Difference: Calculate the difference between number pairs incl negative integers (1)
413.		Spot the Difference: Calculate the difference between number pairs incl negative integers (1)
414.		Spot the Difference: Calculate the difference between number pairs incl negative integers (1)
415.		Spot the Difference: Calculate the difference between number pairs incl negative integers (1)
416.		Hundredths crossing: Addition of numbers with 2 dp
417.		Hundredths crossing: Addition of numbers with 2 dp
418.		Hundredths crossing: Addition of numbers with 2 dp
419.		It's A Bug's Life - 17 years after 2004
420.		What An Eye-Full! 1 - calculate length and convert from m to mm
421.		What An Eye-Full! 2 - calculate length in meters
422.		Al's Mass Mechanics - adding masses in kg and g, 2 decimal places
423.		Al's Mass Mechanics - subtracting masses, kg and g, 3 decimal places