4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 83 · 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. 1.6952 − 4831 =
2. 2.6951 − 3278 =
3. 3.2714 − 1206 =
4. 4.1746 + 5814 =
5. 5.7784 − 5165 =
6. 6.4951 + 8218 =
7. 7.1561 + 3090 =
8. 8.5054 + 7965 =
9. 9.4148 + 6822 =
10. 10.5251 − 2649 =
11. 11.2771 − 1831 =
12. 12.8806 − 4257 =
13. 13.7019 + 5876 =
14. 14.2283 + 1377 =
15. 15.2635 + 4657 =
16. 16.8963 + 1700 =
17. 17.1683 + 4910 =
18. 18.8900 − 7755 =
19. 19.4531 − 3177 =
20. 20.8748 − 7513 =
21. 21.2931 + 7266 =
22. 22.8814 + 4725 =
23. 23.8862 − 7027 =
24. 24.2907 − 2064 =
25. 25.8905 − 2909 =
26. 26.1496 + 1769 =
27. 27.2495 + 2019 =
28. 28.2806 − 2508 =
29. 29.7124 + 6689 =
30. 30.6297 + 3238 =
31. 31.8760 − 4489 =
32. 32.3124 − 3056 =
33. 33.6487 − 6230 =
34. 34.7411 − 6743 =
35. 35.7775 + 4321 =
36. 36.6434 + 3187 =
37. 37.3335 + 1791 =
38. 38.1899 + 5078 =
39. 39.3209 + 5870 =
40. 40.8038 − 4122 =

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