4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 165 · 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. 1.5906 − 5202 =
2. 2.7181 − 5818 =
3. 3.5973 + 7392 =
4. 4.1810 − 1287 =
5. 5.5986 + 8077 =
6. 6.6713 − 5143 =
7. 7.5934 + 6937 =
8. 8.7315 + 6200 =
9. 9.2060 + 8283 =
10. 10.2611 + 6029 =
11. 11.8612 − 6876 =
12. 12.3925 + 4247 =
13. 13.5431 + 2857 =
14. 14.4732 + 6853 =
15. 15.8148 − 4841 =
16. 16.6339 + 6204 =
17. 17.6646 − 2016 =
18. 18.8540 − 8107 =
19. 19.8366 − 2579 =
20. 20.2854 + 4351 =
21. 21.7406 + 3388 =
22. 22.6081 + 6552 =
23. 23.2305 + 5351 =
24. 24.3344 + 1846 =
25. 25.1236 + 6476 =
26. 26.7856 − 2538 =
27. 27.7813 − 5383 =
28. 28.3140 + 1587 =
29. 29.8274 + 2209 =
30. 30.1283 + 7518 =
31. 31.6511 − 4300 =
32. 32.6948 − 1523 =
33. 33.3876 − 3489 =
34. 34.8875 + 4157 =
35. 35.7992 − 6460 =
36. 36.8653 + 8778 =
37. 37.7414 + 3823 =
38. 38.6368 − 1793 =
39. 39.1458 + 3122 =
40. 40.5904 + 7576 =

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