4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 5 · 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. 1.6738 + 5479 =
2. 2.8880 − 5635 =
3. 3.7584 + 4940 =
4. 4.3387 + 7401 =
5. 5.2412 − 2177 =
6. 6.5510 + 2357 =
7. 7.6776 + 4322 =
8. 8.7589 − 1590 =
9. 9.7623 − 6344 =
10. 10.8647 + 8213 =
11. 11.4118 − 3303 =
12. 12.8350 + 6042 =
13. 13.7898 − 1823 =
14. 14.5636 − 3370 =
15. 15.3501 − 2417 =
16. 16.2891 + 3613 =
17. 17.5806 − 3974 =
18. 18.4267 + 7921 =
19. 19.4734 − 4135 =
20. 20.7491 − 2876 =
21. 21.7497 + 3023 =
22. 22.7743 − 3379 =
23. 23.2424 + 5411 =
24. 24.6430 + 2286 =
25. 25.7160 + 8521 =
26. 26.8624 − 5799 =
27. 27.7767 − 4140 =
28. 28.7578 − 1279 =
29. 29.6441 + 1792 =
30. 30.2251 + 1891 =
31. 31.4092 + 6040 =
32. 32.6586 + 4032 =
33. 33.2736 + 7411 =
34. 34.5443 + 2459 =
35. 35.3840 − 2063 =
36. 36.7547 − 2793 =
37. 37.8712 + 6217 =
38. 38.7579 + 6785 =
39. 39.6462 + 4104 =
40. 40.4824 + 1830 =

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