4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 158 · 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. 1.6142 − 1139 =
2. 2.8451 − 1532 =
3. 3.6083 + 6411 =
4. 4.7777 − 5251 =
5. 5.4117 + 3541 =
6. 6.8220 − 6398 =
7. 7.1256 + 7616 =
8. 8.2195 + 1913 =
9. 9.5610 − 5150 =
10. 10.3260 + 5992 =
11. 11.4690 − 2370 =
12. 12.6186 − 3891 =
13. 13.2538 + 1233 =
14. 14.8609 − 2552 =
15. 15.5586 − 1167 =
16. 16.3764 − 1734 =
17. 17.5451 + 3867 =
18. 18.3271 + 1306 =
19. 19.8482 − 4501 =
20. 20.4309 + 4373 =
21. 21.2777 + 3339 =
22. 22.5656 − 1477 =
23. 23.6852 − 4021 =
24. 24.3891 + 8724 =
25. 25.8544 − 6565 =
26. 26.8156 − 3052 =
27. 27.3042 + 3688 =
28. 28.7777 + 6281 =
29. 29.6736 − 5591 =
30. 30.5109 − 1498 =
31. 31.6994 − 4283 =
32. 32.8462 − 1247 =
33. 33.5919 − 3336 =
34. 34.2031 + 4943 =
35. 35.4868 − 1368 =
36. 36.8839 − 3644 =
37. 37.5658 + 6639 =
38. 38.3943 − 3362 =
39. 39.1895 − 1389 =
40. 40.5629 + 4071 =

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