4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 76 · 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. 1.3630 + 2845 =
2. 2.5583 − 1304 =
3. 3.7279 − 1523 =
4. 4.6641 + 3749 =
5. 5.1444 + 1890 =
6. 6.2030 + 2325 =
7. 7.1408 + 7051 =
8. 8.6116 + 6998 =
9. 9.8020 − 6809 =
10. 10.5654 + 8626 =
11. 11.2928 − 2518 =
12. 12.1469 + 2824 =
13. 13.2715 + 4281 =
14. 14.5640 + 1117 =
15. 15.2044 + 3945 =
16. 16.8938 − 3450 =
17. 17.7358 + 3872 =
18. 18.6227 − 5220 =
19. 19.2312 + 4110 =
20. 20.8748 + 6123 =
21. 21.6470 − 4086 =
22. 22.3561 + 4013 =
23. 23.2362 + 3687 =
24. 24.8506 − 8117 =
25. 25.7933 + 4014 =
26. 26.5404 + 2058 =
27. 27.7826 + 4330 =
28. 28.8273 − 4576 =
29. 29.3750 − 2279 =
30. 30.1504 + 5379 =
31. 31.8958 + 8261 =
32. 32.8486 + 3847 =
33. 33.8342 + 7994 =
34. 34.7136 + 8000 =
35. 35.7441 − 4921 =
36. 36.5893 − 3331 =
37. 37.1490 + 1785 =
38. 38.7099 + 6205 =
39. 39.1838 + 2138 =
40. 40.1407 + 2584 =

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