Step 3

Difficulty 3

1. Number detectives: 102+98=?
2. Number detectives: 56+92=?
3. Number detectives: 201+99=?
4. Same or Different: Answer 62
5. Same or Different: Answer 66
6. Same or Different: Answer 73
7. Hundreds and hundreds: ?64+5?9=90?
8. Hundreds and hundreds: 364+235=?
9. Make 1000: 500+300+?
10. Make 1000: 600+300+?
11. Make 1000: 400+100+?
12. Make 1000: 400+200+?
13. Make 1000: 200+100+?
14. Make 1000: 250+300+*
15. Make 1000: 750+50+*
16. Number detectives: 30+?, 20+?, 10+?=100
17. Number detectives: 82+?, 24+?, 76+?=100
18. Number detectives: 89+?, 21+?, 59+?=100
19. Addition chains 10 multiples
20. Addition chains 10 multiples
21. Addition chains 10 multiples
22. Anyone for a burger?:$4+$5+$2+$2+$2
23. Anyone for a burger?:$4+$6+$1+$3
24. Bargain basement: $16+$4+$50
25. Add it up: Addition with regrouping 314+428
26. Add it up: Addition with regrouping 628+347
27. Add it up: Addition with regrouping 249+344
28. Add it up: Addition with regrouping 638+143
29. Add it up: Addition with regrouping 773+219
30. Add it up: Addition with regrouping 315+27
31. Add it up: Addition with regrouping 259+28
32. Add it up: Addition with regrouping 437+44
33. Add it up: Addition with regrouping 673+19
34. Add it up: Addition with regrouping 536+38
35. Hundreds and hundreds: 597+600=?
36. Hundreds and hundreds: 643+600=?
37. Hundreds and hundreds: 756+800=?
38. Helen at the sweet shop: 40c+25c+30c+50c
39. True or False?: 12+8=17+4
40. True or False?: 63+8=65+6
41. True or False?: 11+8=13+7
42. True or False?: 26+7=29+4
43. True or False?: 37+8=39+7
44. Add it up: 583+228
45. Add it up: 509+199
46. Add it up: 341+189
47. Add it up: 1288+252
48. Add it up: 2273+339
49. Add it up: 6082+889
50. Add Board: Complete vertical algorithm
51. Take tens: 527-?=497
52. Take tens: 849-?=759
53. Take tens: 321-?=251
54. Take tens: 513-?=463
55. Take tens: 655-?=595
56. Mysteries of 100!: 100-?=77, 100-?=60, 100-?=88
57. Mysteries of 100!: 100-?=45, 100-?=28, 100-?=66
58. Mysteries of 100!: 100-?=40, 100-?=75, 100-?=62
59. Mysteries of 100!: 100-?=19, 100-?=80, 100-?=69
60. Mysteries of 100!: 100-?=76, 100-?=65, 100-?=54
61. Anyone for a burger?: $20-($5+$4+$1+$2)
62. Anyone for a burger?: $20-($6+$5+$1+$3)
63. Anyone for a burger?: $50-($6+$6+$1+$4+$3+$3)
64. 100 zone: 600-3, 400-5, 200-7
65. 100 zone: 900-9, 700-7, 500-5
66. 100 zone: 700-2, 300-4, 100-6
67. 100 zone: 400-6, 300-4, 200-2
68. 100 zone: 800-8, 600-6, 400-4
69. Take it away: Subtraction with decomposition 791-338
70. Take it away: Subtraction with decomposition 874-258
71. Take it away: Subtraction with decomposition 362-139=?
72. Take it away: Subtraction with decomposition 984-427=?
73. Take it away: Subtraction with decomposition 653-137=?