4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 172 · 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. 1.6415 − 6051 =
2. 2.7710 + 8439 =
3. 3.1236 + 4686 =
4. 4.6696 − 3478 =
5. 5.8326 − 6232 =
6. 6.6321 + 8841 =
7. 7.8635 + 3124 =
8. 8.7810 − 3563 =
9. 9.7509 − 6712 =
10. 10.3478 − 2044 =
11. 11.6341 − 2254 =
12. 12.1241 + 8135 =
13. 13.1586 + 8254 =
14. 14.7009 − 4629 =
15. 15.8728 + 4012 =
16. 16.6273 + 6251 =
17. 17.2480 + 3225 =
18. 18.8019 + 4517 =
19. 19.7715 − 3932 =
20. 20.6646 + 2299 =
21. 21.3161 + 3861 =
22. 22.3708 − 2121 =
23. 23.7701 − 7385 =
24. 24.1429 − 1111 =
25. 25.7806 − 6971 =
26. 26.8539 − 5061 =
27. 27.2590 + 7900 =
28. 28.6529 − 2177 =
29. 29.2948 + 5414 =
30. 30.8063 − 3091 =
31. 31.7988 − 5769 =
32. 32.8828 + 4157 =
33. 33.6248 − 5143 =
34. 34.7957 − 1121 =
35. 35.7784 + 4895 =
36. 36.8883 − 6572 =
37. 37.3350 + 8756 =
38. 38.1369 + 4634 =
39. 39.4307 + 3140 =
40. 40.6300 + 8013 =

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