4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 145 · 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. 1.7148 + 7152 =
2. 2.8021 − 2649 =
3. 3.1215 + 1673 =
4. 4.5395 + 6852 =
5. 5.8089 − 2276 =
6. 6.6804 + 5036 =
7. 7.7175 − 1935 =
8. 8.7057 − 6421 =
9. 9.4810 − 2196 =
10. 10.2089 − 1672 =
11. 11.4318 + 7181 =
12. 12.2385 − 2126 =
13. 13.7002 − 5956 =
14. 14.6602 − 4798 =
15. 15.8597 + 7339 =
16. 16.7968 − 5594 =
17. 17.2479 − 2101 =
18. 18.1533 + 8467 =
19. 19.8862 − 1597 =
20. 20.7387 + 7437 =
21. 21.7855 + 1305 =
22. 22.1505 + 8866 =
23. 23.8876 + 6699 =
24. 24.7986 − 3695 =
25. 25.3978 + 8952 =
26. 26.8870 − 5804 =
27. 27.5563 + 5100 =
28. 28.3543 + 7246 =
29. 29.8055 + 2742 =
30. 30.3535 − 1105 =
31. 31.6091 − 3847 =
32. 32.8568 − 2817 =
33. 33.6162 − 4058 =
34. 34.3372 + 5070 =
35. 35.1933 + 4692 =
36. 36.6836 − 6644 =
37. 37.5398 − 5168 =
38. 38.7103 − 1924 =
39. 39.5267 − 3053 =
40. 40.8011 − 3582 =

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