4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 38 · 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. 1.4984 − 4557 =
2. 2.5162 − 1251 =
3. 3.5150 + 3979 =
4. 4.8401 + 6555 =
5. 5.7602 − 4006 =
6. 6.7247 + 7709 =
7. 7.3443 + 5816 =
8. 8.3015 − 2889 =
9. 9.7586 + 3091 =
10. 10.5490 − 2654 =
11. 11.1805 + 6412 =
12. 12.3211 + 3066 =
13. 13.5048 + 8183 =
14. 14.8292 − 6637 =
15. 15.6880 − 6632 =
16. 16.2555 + 2768 =
17. 17.8833 + 7109 =
18. 18.2898 − 1559 =
19. 19.7841 − 3587 =
20. 20.8588 + 1437 =
21. 21.7903 − 2533 =
22. 22.3114 + 3004 =
23. 23.7159 + 1460 =
24. 24.3542 − 1737 =
25. 25.1363 + 2406 =
26. 26.8946 + 8404 =
27. 27.5395 − 4529 =
28. 28.8985 − 6391 =
29. 29.8445 + 4550 =
30. 30.7391 + 7129 =
31. 31.4739 + 4291 =
32. 32.7348 − 6880 =
33. 33.7828 − 7120 =
34. 34.6254 − 4375 =
35. 35.7680 − 3884 =
36. 36.3426 − 2829 =
37. 37.7740 − 7529 =
38. 38.8465 − 2937 =
39. 39.8599 + 3668 =
40. 40.6565 + 1510 =

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