4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 216 · 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. 1.3940 + 6748 =
2. 2.3991 − 2504 =
3. 3.5826 − 4809 =
4. 4.5381 + 3467 =
5. 5.5276 + 4370 =
6. 6.6735 + 2282 =
7. 7.4861 + 7904 =
8. 8.8171 − 2209 =
9. 9.5663 − 3760 =
10. 10.6397 − 1170 =
11. 11.3551 + 1907 =
12. 12.6712 + 6511 =
13. 13.8271 − 8107 =
14. 14.2109 + 8008 =
15. 15.2503 + 4631 =
16. 16.3604 − 2671 =
17. 17.6149 − 6047 =
18. 18.7214 − 5058 =
19. 19.6354 − 2981 =
20. 20.3884 + 4096 =
21. 21.8682 + 2478 =
22. 22.3884 + 2291 =
23. 23.3171 + 4119 =
24. 24.6021 − 4820 =
25. 25.8562 − 1721 =
26. 26.3366 + 5793 =
27. 27.6250 − 3031 =
28. 28.6861 − 5566 =
29. 29.8531 − 5955 =
30. 30.1919 − 1611 =
31. 31.6804 + 8119 =
32. 32.4055 − 3969 =
33. 33.6644 − 3711 =
34. 34.6467 + 1445 =
35. 35.1609 + 8630 =
36. 36.6600 + 4054 =
37. 37.8342 − 1309 =
38. 38.7494 + 7369 =
39. 39.2243 + 5035 =
40. 40.5987 − 3632 =

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