Step 4

Difficulty 4

1. Number detectives: 348+103=?
2. Number detectives: 156+104=?
3. Same or Different: Answer 58
4. Same or Different: Answer 44
5. Hundreds and hundreds: 657+173=830
6. Hundreds and hundreds: 6?8+157=?2?
7. Make 1000: 850+150+*
8. Make 1000: 600+150+*
9. Make 1000: 50+800+*
10. Addition chains 10 multiples
11. Addition chains 10 multiples
12. 100 zone: 295+8=?, 798+?=804, ?+9=405
13. 100 zone: 294+8=?, 396+?=401, ?+4=705
14. 100 zone: 295+9=?, 596+?=602, ?+8=201
15. 100 zone: 399+5=?, 895+7=902, ?+6=503
16. 100 zone: 698+6=704, 292+?=301, ?+8=503
17. Comp. pairs add/subtract: 678+156=834
18. Comp. pairs add/subtract: 246+357=603
19. Comp. pairs add/subtract: 545+328=873
20. Comp. pairs add/subtract: 488+323=811
21. Comp. pairs add/subtract: 493+257=750
22. Hundreds and hundreds: Complete vertical hundreds addition
23. Hundreds and hundreds: Complete vertical hundreds addition
24. 100 zone: *+95=500 365+*=400 625+75=*
25. 100 zone: *+185=200 655+*=700 335+65=*
26. 100 zone: *+25=300 445+*=500 895+5=*
27. 100 zone: *+45=400 165+*=200 725+75=*
28. 100 zone: *+85=700 405+*=500 375+25=*
29. Bessie's found her marbles: 327 - (158+57+63+90)
30. CD players $285 - $128
31. Same or Different: Answer 42
32. Same or Different: Answer 50
33. Same or Different: Answer 85
34. Same or Different: Answer 76
35. Same or Different: Answer 24
36. Same or Different: Answer 60
37. Same or Different: Answer 32
38. Same or Different: Answer 45
39. Same or Different: Answer 21
40. Same or Different: Answer 55
41. Hundreds Takeaway: *00 - 37 = 66*
42. Hundreds Takeaway: *00 - *8 = 352
43. Hundreds Takeaway: 800 - **5 = 45
44. Hundreds Takeaway: *00 - 569 = *1
45. Take tens: 734-50=?
46. Take tens: 408-90=?
47. Take tens: 978-80=?
48. Take tens: 345-70=?
49. Take tens: 533-60=?
50. Subtraction chains: 87-14-13-15, 98-17-11-6
51. Subtraction chains: 79-14-15-12, 68-17-20-11
52. Subtraction chains: 76-13-12-11, 92-20-12-14
53. Subtraction chains: 94-20-14-11, 65-15-25-15
54. Bargain basement: $50-(3x$8+2x$2+$10)
55. Bargain basement: $50-(1x$10+3x$2+$10)
56. Laura at sweet shop: $5-($1+25c+5x10c)
57. Carla at sweet shop: $5-(2x10c+20c+4x10c)
58. 1000s crossing: 6002-6, 4001-4, 2005-7
59. 1000s crossing: 7002-8, 5004-7, 3003-6,
60. 1000s crossing: 9002-9, 18006-7, 7007-9
61. 1000s crossing: 5001-5, 10003-5, 1004-5
62. 1000s crossing: 8004-7, 13003-8, 4006-9
63. Tens Takeaway: 400-20, 40 less than 480, ?-80=360
64. Tens Takeaway: 500-50, 70 less than 700, ?-90=810
65. Tens Takeaway: 900-30, 10 less than 400, ?-60=40
66. Tens Takeaway: 300-80, 50 less than 700, ?-90=110
67. Tens Takeaway: 600-20, 70 less than 500, ?-30=370
68. Hundreds and Thousands: 1643 - 788 = *55
69. Sarah at the shop: $2 - (40c + 30c + 50c + 5c)
70. Tina at the shop: $2 - (60c + 45c + 25c + 30c)