4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 62 · 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. 1.5566 − 1990 =
2. 2.2692 + 3391 =
3. 3.7094 − 2268 =
4. 4.3978 + 8138 =
5. 5.1843 − 1814 =
6. 6.5975 + 7202 =
7. 7.3602 + 8199 =
8. 8.7856 − 5898 =
9. 9.7060 + 1279 =
10. 10.7664 + 1138 =
11. 11.6070 + 4330 =
12. 12.5466 − 3611 =
13. 13.3054 + 2459 =
14. 14.6633 − 1287 =
15. 15.6443 − 3753 =
16. 16.7004 − 1229 =
17. 17.3184 − 1384 =
18. 18.2389 + 4400 =
19. 19.4992 + 4146 =
20. 20.6484 + 7016 =
21. 21.1148 + 3383 =
22. 22.2711 + 1910 =
23. 23.8388 + 1447 =
24. 24.3604 + 1257 =
25. 25.6367 − 4621 =
26. 26.8532 + 3112 =
27. 27.5344 − 1303 =
28. 28.3202 + 1524 =
29. 29.2604 + 2136 =
30. 30.2136 − 1395 =
31. 31.1428 + 7303 =
32. 32.4893 − 4706 =
33. 33.8819 + 2358 =
34. 34.8138 − 2436 =
35. 35.5422 + 1892 =
36. 36.4491 + 2992 =
37. 37.7857 − 3245 =
38. 38.7501 − 2879 =
39. 39.1681 + 8737 =
40. 40.5301 + 6556 =

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