4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 18 · 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. 1.7992 + 3816 =
2. 2.7898 + 6104 =
3. 3.6727 − 2598 =
4. 4.6720 + 8059 =
5. 5.6161 + 1838 =
6. 6.5072 + 6383 =
7. 7.8213 − 3045 =
8. 8.2119 − 2112 =
9. 9.6072 + 7368 =
10. 10.7147 + 6200 =
11. 11.4248 + 8116 =
12. 12.2357 + 3564 =
13. 13.4715 + 3403 =
14. 14.8804 − 2005 =
15. 15.7156 − 5197 =
16. 16.5137 − 1854 =
17. 17.4169 − 1705 =
18. 18.5202 + 3736 =
19. 19.5595 + 1115 =
20. 20.1697 + 2161 =
21. 21.8301 − 7400 =
22. 22.8037 − 4272 =
23. 23.5585 + 3948 =
24. 24.6990 − 6100 =
25. 25.5589 + 1535 =
26. 26.1261 + 8504 =
27. 27.4845 − 2916 =
28. 28.1692 + 2529 =
29. 29.4539 + 7494 =
30. 30.8371 + 7457 =
31. 31.2455 + 6396 =
32. 32.3072 + 4027 =
33. 33.6873 − 2632 =
34. 34.2102 + 8195 =
35. 35.8340 + 5746 =
36. 36.4864 − 3143 =
37. 37.8410 + 4104 =
38. 38.5697 − 3785 =
39. 39.5594 + 3361 =
40. 40.3425 + 1271 =

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