Step 1

Difficulty 1

1. Make 400: 200+100+?
2. Make 500: 100+200+?
3. Make 600: 50+550+?
4. Make 800: 125+225+?
5. Make 900: 275+375+?
6. Same or different: Click all the boxes with the same answer.
7. Same or different: Click all the boxes with the same answer.
8. True or False?: 26+46=72 13+29=44 62+18=80 38+25=53
9. True or False?: 27+18=45 32+39=49 49+27=76 57+26=83
10. True or False?: 19+49=58 48+33=81 24+37=62 64+28=90
11. Number Detectives: Mystery Teens
12. Number Detectives: Mystery Teens
13. Number Detectives: Mystery Teens
14. Number Detectives: Mystery Teens
15. Add it up: 347+454
16. Add it up: 627+277
17. Add it up: 7239+697
18. Write the missing number: 750+100+?=1000
19. Write the missing number: 600+50+?=1000
20. Write the missing number: 500+450+?=1000
21. Write the missing number: 250+50+?=1000
22. Write the missing number: 650+100+?=1000
23. True or False?: 50-5=90-45
24. True or False?: 36-7=20-8
25. True or False?: 35-15=40-20
26. Hundreds Takeaway: 658 - *79 = 1*9
27. Hundreds Takeaway: 9*1 - *52 = 1*9
28. Hundreds Takeaway: **1 - 21* = 185
29. Mysteries of 50!: 50-?=46, 36, 26
30. Mysteries of 60!: 60-?=35, 30, 45
31. Mysteries of 60!: 60-?=40, 30, 20
32. Mysteries of 60!: 60-?=32, 28, 16
33. Mysteries of 50!: 50-?=17, 28, 39
34. Mysteries of 50!: 50-?=33, 8, 24
35. Mysteries of 50!: 50-?=34, 25, 14
36. Mysteries of 70!: 70-?=44, 38, 29
37. Mysteries of 70!: 70-?=58, 33, 9
38. Mysteries of 70!: 70-?=28, 35, 43
39. Subtraction Chains
40. Subtraction Chains
41. Subtraction Chains
42. Subtraction Chains
43. Subtraction Chains
44. Subtraction Chains
45. Subtraction Chains
46. Subtraction Chains
47. Subtraction Chains
48. Take it away: 422 - 114 = ?
49. Take it away: 650 - 322 = ?
50. Take it away: 456 - 245 = ?
51. Take it away: 763 - 335 = ?
52. Take it away: 389 - 147 = ?
53. Same or different: Click all the boxes with the same answer.
54. Same or different: Click all the boxes with the same answer.
55. Same or different: Click all the boxes with the same answer.
56. Duncan at the sweet shop: $10-($1+$2+$1.20+$1.20)