4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 68 · 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. 1.6923 + 2662 =
2. 2.7043 − 2842 =
3. 3.3208 + 8710 =
4. 4.5744 + 1610 =
5. 5.6629 + 1545 =
6. 6.8498 + 4732 =
7. 7.7690 + 5790 =
8. 8.3456 − 1442 =
9. 9.7752 − 3955 =
10. 10.2045 + 2721 =
11. 11.6284 + 8570 =
12. 12.4844 − 4468 =
13. 13.7579 − 6174 =
14. 14.2793 + 3865 =
15. 15.3329 − 2067 =
16. 16.7713 − 3677 =
17. 17.2874 + 1620 =
18. 18.7972 − 3227 =
19. 19.7644 − 2053 =
20. 20.4099 + 2070 =
21. 21.8753 − 4751 =
22. 22.2882 − 2594 =
23. 23.4505 + 6378 =
24. 24.7132 − 3611 =
25. 25.2542 + 2437 =
26. 26.7675 − 5176 =
27. 27.6789 − 2399 =
28. 28.8078 + 6043 =
29. 29.3914 − 2268 =
30. 30.3347 + 3392 =
31. 31.6283 − 1488 =
32. 32.7802 − 3892 =
33. 33.4226 − 2708 =
34. 34.5628 + 7602 =
35. 35.5593 − 1552 =
36. 36.1177 + 5280 =
37. 37.6533 − 1577 =
38. 38.2398 − 1302 =
39. 39.5848 + 5241 =
40. 40.7664 − 1882 =

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