4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 96 · 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. 1.1966 + 3468 =
2. 2.2804 + 5691 =
3. 3.8982 − 2294 =
4. 4.6907 + 1158 =
5. 5.7690 + 6788 =
6. 6.5093 − 4531 =
7. 7.2662 + 5634 =
8. 8.8947 − 2668 =
9. 9.8588 − 6312 =
10. 10.3226 + 8199 =
11. 11.1494 + 5934 =
12. 12.4546 + 4146 =
13. 13.5938 − 2243 =
14. 14.5639 + 1787 =
15. 15.7873 + 4056 =
16. 16.7393 − 5042 =
17. 17.4371 + 2546 =
18. 18.6813 + 7917 =
19. 19.6163 − 1206 =
20. 20.2716 − 2111 =
21. 21.7204 − 4836 =
22. 22.7831 + 4318 =
23. 23.4014 + 1623 =
24. 24.8742 − 6170 =
25. 25.4090 + 3389 =
26. 26.7357 − 1275 =
27. 27.2127 − 1614 =
28. 28.4638 − 3864 =
29. 29.8387 − 2571 =
30. 30.6054 − 5786 =
31. 31.6354 + 4328 =
32. 32.2293 + 4506 =
33. 33.8753 − 7155 =
34. 34.4377 + 1778 =
35. 35.7418 − 4349 =
36. 36.6515 + 3160 =
37. 37.3743 + 7181 =
38. 38.7868 − 5602 =
39. 39.1866 + 8410 =
40. 40.1967 − 1131 =

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