4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 125 · 40 questions

The fast method (Split and join): Split each 4-digit number into two 2-digit halves: 4768 → 47|68. Work out the left halves and the right halves on their own. Adding: a right half of 100 or more carries 1 to the left half. Subtracting: right half too small? Borrow 1 from the left half — it is worth 100 on the right.

1. 1.1521 − 1269 =
2. 2.8231 − 7254 =
3. 3.1518 − 1482 =
4. 4.3342 − 1233 =
5. 5.5861 + 3952 =
6. 6.7158 − 6199 =
7. 7.8215 + 6228 =
8. 8.1123 + 2028 =
9. 9.5968 − 5963 =
10. 10.7805 − 4509 =
11. 11.1405 + 7959 =
12. 12.4487 + 5963 =
13. 13.6136 + 5294 =
14. 14.6496 + 4911 =
15. 15.8495 − 8247 =
16. 16.5919 − 3621 =
17. 17.2269 + 5613 =
18. 18.8192 − 5802 =
19. 19.2176 + 4405 =
20. 20.7221 + 4783 =
21. 21.2831 + 8461 =
22. 22.2127 + 2224 =
23. 23.1453 + 7427 =
24. 24.3432 + 5098 =
25. 25.5110 − 1511 =
26. 26.7878 + 4626 =
27. 27.8411 + 5784 =
28. 28.7867 − 3645 =
29. 29.2678 + 2813 =
30. 30.3900 + 4588 =
31. 31.5741 − 5735 =
32. 32.6975 − 5611 =
33. 33.6550 − 1392 =
34. 34.3860 + 2464 =
35. 35.4082 − 1122 =
36. 36.8849 − 5018 =
37. 37.5718 − 1639 =
38. 38.6096 − 2107 =
39. 39.8774 − 1553 =
40. 40.3307 − 2787 =

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