4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 86 · 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. 1.5426 − 3455 =
2. 2.6487 − 3534 =
3. 3.6904 + 3013 =
4. 4.6167 − 1173 =
5. 5.6789 + 7385 =
6. 6.2967 + 8225 =
7. 7.5701 + 2774 =
8. 8.2528 + 1387 =
9. 9.6451 − 5349 =
10. 10.5811 + 5399 =
11. 11.3074 + 8423 =
12. 12.7362 − 4477 =
13. 13.1638 + 6927 =
14. 14.6029 + 5238 =
15. 15.5429 + 2309 =
16. 16.6272 − 5051 =
17. 17.1404 + 4702 =
18. 18.3607 + 2978 =
19. 19.7469 + 1722 =
20. 20.4231 + 2095 =
21. 21.1265 + 6434 =
22. 22.7525 + 4350 =
23. 23.6620 − 2049 =
24. 24.2010 + 2261 =
25. 25.6556 − 2972 =
26. 26.3387 + 4692 =
27. 27.6892 − 6419 =
28. 28.4978 + 8056 =
29. 29.1887 + 8842 =
30. 30.2898 − 1535 =
31. 31.4778 + 6860 =
32. 32.3867 + 8179 =
33. 33.7426 − 3524 =
34. 34.2831 + 3007 =
35. 35.3733 − 2683 =
36. 36.4903 − 3945 =
37. 37.8858 − 2437 =
38. 38.6569 − 5858 =
39. 39.8427 + 4745 =
40. 40.2388 + 4466 =

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