4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 81 · 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. 1.5429 + 8944 =
2. 2.6537 + 3602 =
3. 3.5403 + 2513 =
4. 4.1624 + 6571 =
5. 5.8569 + 7579 =
6. 6.3992 + 2889 =
7. 7.8793 + 2695 =
8. 8.8244 − 4256 =
9. 9.8375 + 4157 =
10. 10.4360 + 2622 =
11. 11.1280 + 8389 =
12. 12.7345 − 1572 =
13. 13.4044 + 2405 =
14. 14.4164 + 6202 =
15. 15.5265 + 1514 =
16. 16.6438 + 4001 =
17. 17.6593 − 2809 =
18. 18.2152 − 2053 =
19. 19.5421 − 1729 =
20. 20.1594 + 2874 =
21. 21.2315 + 5121 =
22. 22.1391 + 5154 =
23. 23.8985 − 7104 =
24. 24.2816 + 4314 =
25. 25.4144 + 2740 =
26. 26.3845 + 3421 =
27. 27.7030 − 4715 =
28. 28.8316 − 1651 =
29. 29.5005 + 8012 =
30. 30.4645 + 6238 =
31. 31.8577 + 1584 =
32. 32.6572 − 4164 =
33. 33.7392 + 5678 =
34. 34.4106 + 8326 =
35. 35.8010 − 4118 =
36. 36.8254 − 3636 =
37. 37.8392 − 7840 =
38. 38.8661 + 7834 =
39. 39.4890 − 3482 =
40. 40.2876 + 1756 =

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