# VCMNA106

Explore the connection between addition and subtraction

 1 Changing Numbers: 48 to 47 2 Changing Numbers: 27 to 29 3 Changing Numbers: 68 to 58 4 Changing Numbers: 90 to 85 5 Changing Numbers: 66 to 76 6 Changing Numbers: 10 to 15 7 Changing Numbers: 20 to 30 8 Changing Numbers: 45 to 35 9 Changing Numbers: 90 to 100 10 Changing Numbers: 85 to 80 11 Changing Numbers: 45 to 50 12 Changing Numbers: 99 to 100 13 Changing Numbers: 24 to 14 14 Changing Numbers: 85 to 80 15 Changing Numbers: 48 to 50 16 Changing Numbers: 324 to 314 17 Changing Numbers: 562 to 662 18 Changing Numbers: 500 to 510 19 Changing Numbers: 444 to 445 20 Changing Numbers: 265 to 255 21 Changing Numbers: 300 to 299 22 Changing Numbers: 888 to 898 23 Changing Numbers: 428 to 438 24 Changing Numbers: 204 to 194 25 Changing Numbers: 402 to 412 26 Changing Numbers: 399 to 499 27 Changing Numbers - 45 to 145 28 Changing Numbers - 235 to 225 29 Changing Numbers - 990 to 890 30 Changing Numbers - 576 to 577 31 Changing Numbers - 36 to 136 32 Changing Numbers - 455 to 555 33 Make 20: 7+4+? 34 Make 20: 11+5+? 35 Make 20: 8+9+? 36 Number Detectives: 10 + ? = 34 37 Make 50: 20+10+? 38 Number detectives: Mysteries of 15 39 Number detectives: Mysteries of 16 40 Number detectives: Mysteries of 17 41 Number detectives: Mysteries of 14 42 Addition Chains 43 Addition Chains 44 Addition Chains 45 Addition Chains 46 Addition Chains 47 Make 30: 10 + 11 + ? = 30 48 Make 30: 19 + 2 + ? = 30 49 Make 30: 20 + 10 + ? = 30 50 Make 30: 16 + 4 + ? = 30 51 Make 30: 20 + 7 + ? = 30 52 Make 30: 18 + 3 + ? = 30 53 Changing numbers: 24 changes to 33 54 Changing numbers: 19 changes to 28 55 Changing numbers: 13 changes to 21 56 Changing numbers: 9 changes to 17 57 Changing numbers: 8 changes to 17 58 Number Detectives: ? + 7 = 30 59 Number Detectives: ? + 24 = 30 60 Number Detectives: 22 + ? = 30 61 Number Detectives: 21 + ? = 30 62 Make 50: 40 + 4 + ? 63 Make 36: 20 + 14 + ? 64 Make 39: 30 + 6 + ? 65 Make 37: 12 + 20 + 5 66 Make 34: 10 + 22 + ? 67 Number detectives: 30+?, 50+?, 60+? =100 68 Addition Chains: 10 + 4 + 6 + 2, 11 + 2 + 3 + 4 69 Addition Chains: 4 + 5 + 6 + 8, 11 + 4 + 3+ 7 70 Addition Chains: 3 + 2 + 4 + 8, 4 + 3 + 7 + 4 71 Number detectives: ? + 9 = 49 72 Number detectives: ? + 11 = 53 73 Number detectives: 35+? = 46 74 Make 50: 39+7+? = 50 75 Make 50: 39+5+? = 50 76 Make 50: 35+5+? = 50 77 Make 50: 38+10+? = 50 78 Make 50: 42+6+? = 50 79 N/D Mysteries of 40! 34+? 30+? 38+?=40 80 N/D Mysteries of 40! 31+? 36+? 30+?=40 81 N/D Mysteries of 40! 33+? 37+? 32+?=40 82 N/D Mysteries of 40! 32+? 39+? 34+?=40 83 N/D Mysteries of 40! 31+? 35+? 37+?=40 84 36 + 12 = 48 So what else is true? 85 Add board 5* + 46 = *8 86 Add board 35 + *3 = 7* 87 Number detectives: ? - 5 = 10 88 Number detectives: ? - 7 = 6 89 Number detectives: ? - 8 = 4 90 Write the missing number: 15 + 1 + ? = 20 91 Write the missing number: ? + 11 + 2 = 20 92 Write the missing number: 3 + 4 + ? = 20 93 Write the missing number: ? + 5 + 6 = 20 94 Write the missing number: 5 + 8 + ? = 20 95 Write the missing number: 4 + 8 + ? = 20 96 Write the missing number: 11 + ? + 2 = 20 97 Write the missing number: ? + 13 + 4 = 20 98 Write the missing number: 6 + 9 + ? = 20 99 Write the missing number: 4 + ? + 6 = 20 100 Subtraction chain 20 - 12 = ? - 6 = 2 101 Takeaway board: 17-?=11 102 Takeaway board: 15-?=11 103 Takeaway board: 18-? = 12 104 Takeaway board: 16-? = 13 105 Takeaway board: 19-? = 14 106 Put in the missing number: 5 + 4 + ? = 16 107 Put in the missing number: 11 + ? + 6 = 25 108 Write in the missing number: ? + 13 + 5 = 21 109 Put in the missing number: 9 + 2 + ? = 19 110 Put in the missing number: ? + 10 + 14 = 28 111 Subtraction Chain - 22-4=?-3=15 112 Subtraction Chain - ?-8=16-2=14 113 Subtraction Chain - 21-4 =?-1= 16 114 Subtraction Chain - ?-4=19-3=16 115 Mysteries of Fifty: 50-?=42, 50-?=45 116 Mysteries of Fifty: 50-?=48, 50-?=43 117 Mysteries of Fifty: 50-?=44, 50-?=47 118 Mysteries of Forty: 40-?=36, 40-?=31 119 Mysteries of Forty: 40-?=33, 40-?=39 120 Mysteries of Forty: 40-?=35, 40-?=38 121 Mysteries of Thirty: 30-?=29, 30-?=24 122 Mysteries of Thirty: 30-?=21, 30-?=27 123 Mysteries of Thirty: 30-?=26, 30-?=22 124 Spot the difference between 30 and 15. 125 Spot the difference between 12 and 25. 126 Spot the difference between 30 and 10. 127 Spot the difference between 40 and 10. 128 Spot the difference between 20 and 39. 129 Spot the difference between 18 and 25. 130 Spot the difference between 25 and 34. 131 Spot the difference between 19 and 31. 132 Spot the difference between 19 and 42. 133 Spot the difference between 36 and 15. 134 Same Difference - Difference between 10 and 40. 135 Write the missing number: 20 + 3 + ? = 30 136 Write the missing number: 12 + ? + 10 = 30 137 Write the missing number: 15 + ? + 5 = 30 138 Write the missing number: 9 + ? + 12 = 30 139 Write the missing number: ? + 5 + 4 = 30 140 Write the missing number: 15 + ? + 6 = 30 141 Write the missing number: 18 + ? + 2 = 30 142 Write the missing number: 20 + 3 + ? = 30 143 Write the missing number: ? + 13 + 5 = 30 144 Write the missing number: 14 + 7 + ? = 30 145 Number detectives: ? + 23 = 30 146 Number detectives: ? + 18 = 30 147 Number detectives: 30 - ? = 15 148 Number detectives: 30 - ? = 13 149 Subtract.chains 48 - 7 - 2 - 9, 35 - 4 - 3 - 8 150 Subtract.chains 47 - 4 - 3 - 7, 28 - 8 - 2 - 5 151 Subtract.chains 23 - 4 - 1 - 3, 36 - 5 - 2 - 6 152 Subtract.chains 28 - 5 - 2 - 10, 50 - 5 - 3 - 2 153 Spot the difference: 60 & 40, 12 & 18, 100 & 95 154 Spot the difference: 20 & 14, 17 & 9, 80 & 73 155 Spot the difference: 100 & 30, 19 & 11, 30 & 24 156 Spot the difference: 50 & 41, 100 & 92, 101 & 98 157 Subtraction chains 80-6-5-3, 70-4-2-5 158 Subtraction chains 30-9-2-5, 60-5-4-3 159 Subtraction chains 40-5-6-3, 50-9-2-8 160 Subtraction chains 90-3-5-3, 40-2-8-5 161 Subtraction chains 60-9-2-3, 50-3-6-10 162 Build A Total - number sequence, 24 163 Build A Total - number sequence, 11 164 Number Quest - find 1 number to complete 2 number sentences 165 Sign Scramble - complete 2 number sentences using given numbers 166 Build a Total - number sequence, 15 167 Number Quest - find 1 number to complete 2 number sentences 168 Number Quest - find 1 number to complete 2 number sentences 169 16 go to WaterWorld: 5+4+3+? 170 17 go to Waterworld: 6+5+2+? 171 14 go to Waterworld: 6+3+2+? 172 18 go to WaterWorld: 3+3+2+? 173 15 go to WaterWorld: 5+3+2+? 174 16 go to Waterworld? 2+3+3+? 175 19 go to Waterworld: 5+4+3+? 176 Make 50: 32+8+? = 50