4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 2 · 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. 1.8789 + 2781 =
2. 2.8702 + 8009 =
3. 3.6297 − 2876 =
4. 4.6717 − 3854 =
5. 5.5586 + 2498 =
6. 6.6718 − 5000 =
7. 7.7638 − 5385 =
8. 8.8929 − 8377 =
9. 9.7661 + 7058 =
10. 10.5523 − 1935 =
11. 11.1767 + 5251 =
12. 12.7124 + 6623 =
13. 13.1983 + 3278 =
14. 14.2822 − 2141 =
15. 15.4444 + 7741 =
16. 16.6753 − 6604 =
17. 17.5567 + 6311 =
18. 18.8662 − 1121 =
19. 19.6325 − 6254 =
20. 20.6223 + 2142 =
21. 21.7799 + 3565 =
22. 22.4692 − 1820 =
23. 23.7245 − 2821 =
24. 24.2335 + 8226 =
25. 25.8469 + 3405 =
26. 26.4220 − 1804 =
27. 27.4818 − 3852 =
28. 28.6290 − 2080 =
29. 29.6758 + 3262 =
30. 30.4744 + 5748 =
31. 31.8563 − 6147 =
32. 32.2534 + 5887 =
33. 33.2020 + 6363 =
34. 34.8947 − 3865 =
35. 35.6045 + 8644 =
36. 36.8498 + 5797 =
37. 37.6114 − 3909 =
38. 38.5103 − 3189 =
39. 39.4609 + 5657 =
40. 40.8121 − 2202 =

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