4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 72 · 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. 1.8891 + 1398 =
2. 2.8833 − 2448 =
3. 3.8894 + 4550 =
4. 4.8268 − 6974 =
5. 5.7324 + 4162 =
6. 6.7315 + 2489 =
7. 7.5679 − 1751 =
8. 8.3724 − 1435 =
9. 9.3864 + 2880 =
10. 10.5652 + 3151 =
11. 11.2010 − 1724 =
12. 12.8721 − 3910 =
13. 13.5741 + 7900 =
14. 14.5755 − 3289 =
15. 15.8933 + 3920 =
16. 16.7501 − 4385 =
17. 17.5827 + 3415 =
18. 18.6053 + 5844 =
19. 19.1407 + 5571 =
20. 20.3322 + 4611 =
21. 21.5682 + 5235 =
22. 22.6769 − 2491 =
23. 23.4481 − 3893 =
24. 24.3413 − 2123 =
25. 25.4373 − 1786 =
26. 26.3122 + 6579 =
27. 27.4491 − 3931 =
28. 28.7053 − 4444 =
29. 29.3429 − 2528 =
30. 30.3899 + 7328 =
31. 31.5520 + 8026 =
32. 32.5424 + 5800 =
33. 33.4302 − 2633 =
34. 34.7717 + 3082 =
35. 35.8862 − 5654 =
36. 36.4065 + 2053 =
37. 37.7730 − 2802 =
38. 38.6547 − 6428 =
39. 39.3737 + 2586 =
40. 40.1589 + 7162 =

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