Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 688 · 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. 1.519 − 28 =
2. 2.108 − 78 =
3. 3.545 − 99 =
4. 4.377 − 97 =
5. 5.106 − 66 =
6. 6.399 − 17 =
7. 7.348 − 99 =
8. 8.173 − 99 =
9. 9.230 − 18 =
10. 10.420 − 48 =
11. 11.562 − 79 =
12. 12.378 − 78 =
13. 13.226 − 79 =
14. 14.157 − 38 =
15. 15.120 − 16 =
16. 16.177 − 49 =
17. 17.129 − 59 =
18. 18.160 − 16 =
19. 19.178 − 78 =
20. 20.493 − 49 =
21. 21.317 − 46 =
22. 22.87 − 66 =
23. 23.403 − 57 =
24. 24.578 − 17 =
25. 25.494 − 59 =
26. 26.471 − 77 =
27. 27.516 − 19 =
28. 28.107 − 78 =
29. 29.519 − 56 =
30. 30.275 − 36 =
31. 31.341 − 38 =
32. 32.517 − 96 =
33. 33.559 − 88 =
34. 34.449 − 57 =
35. 35.273 − 98 =
36. 36.447 − 38 =
37. 37.294 − 29 =
38. 38.122 − 18 =
39. 39.224 − 57 =
40. 40.55 − 38 =

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