4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 12 · 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. 1.1131 + 6491 =
2. 2.4309 + 7124 =
3. 3.2346 + 3926 =
4. 4.1879 + 5382 =
5. 5.5448 + 7374 =
6. 6.5391 + 8407 =
7. 7.3659 + 7615 =
8. 8.8424 + 6088 =
9. 9.6200 − 5965 =
10. 10.2761 + 8908 =
11. 11.6385 + 6661 =
12. 12.3863 + 1565 =
13. 13.4881 − 2851 =
14. 14.2013 + 7626 =
15. 15.1564 + 4174 =
16. 16.8866 − 5591 =
17. 17.3619 + 1772 =
18. 18.5709 − 4263 =
19. 19.5349 − 3227 =
20. 20.7043 + 1646 =
21. 21.2690 + 4986 =
22. 22.2832 − 1785 =
23. 23.3559 + 3591 =
24. 24.8055 + 6351 =
25. 25.8343 − 1974 =
26. 26.7434 − 7274 =
27. 27.6919 − 3383 =
28. 28.8134 − 4419 =
29. 29.2486 + 1635 =
30. 30.3371 + 5412 =
31. 31.6825 + 5428 =
32. 32.5076 + 7444 =
33. 33.7056 + 3158 =
34. 34.4498 − 2797 =
35. 35.3594 + 6435 =
36. 36.8591 − 2556 =
37. 37.4738 − 4498 =
38. 38.5861 − 4990 =
39. 39.3965 + 1355 =
40. 40.7588 + 4818 =

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