Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 639 · 40 questions

The fast method (Shift both): How much makes the second number round? 68 needs 2 to make 70. Add that amount to BOTH numbers. Take away the round number.

1. 1.121 − 47 =
2. 2.321 − 96 =
3. 3.248 − 36 =
4. 4.433 − 37 =
5. 5.345 − 48 =
6. 6.109 − 68 =
7. 7.323 − 18 =
8. 8.414 − 36 =
9. 9.90 − 68 =
10. 10.422 − 36 =
11. 11.555 − 96 =
12. 12.452 − 57 =
13. 13.112 − 46 =
14. 14.320 − 86 =
15. 15.240 − 57 =
16. 16.126 − 56 =
17. 17.136 − 87 =
18. 18.476 − 88 =
19. 19.280 − 98 =
20. 20.155 − 89 =
21. 21.293 − 87 =
22. 22.226 − 69 =
23. 23.559 − 78 =
24. 24.149 − 68 =
25. 25.416 − 48 =
26. 26.164 − 39 =
27. 27.240 − 26 =
28. 28.66 − 17 =
29. 29.382 − 79 =
30. 30.468 − 17 =
31. 31.381 − 26 =
32. 32.352 − 16 =
33. 33.225 − 39 =
34. 34.435 − 27 =
35. 35.410 − 68 =
36. 36.106 − 38 =
37. 37.504 − 88 =
38. 38.148 − 96 =
39. 39.307 − 57 =
40. 40.550 − 39 =

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