4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 119 · 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. 1.6241 + 5042 =
2. 2.4099 + 4802 =
3. 3.5618 − 2821 =
4. 4.1523 + 7055 =
5. 5.5329 − 1481 =
6. 6.6997 + 2156 =
7. 7.6945 + 6482 =
8. 8.5570 − 2636 =
9. 9.4270 − 3514 =
10. 10.1331 + 5245 =
11. 11.6419 + 6881 =
12. 12.5819 − 4841 =
13. 13.1882 + 4043 =
14. 14.7954 − 1594 =
15. 15.5323 − 4487 =
16. 16.8399 + 8443 =
17. 17.8256 + 7743 =
18. 18.5620 + 8227 =
19. 19.4980 − 1898 =
20. 20.2699 − 2035 =
21. 21.6891 − 1703 =
22. 22.7574 − 7017 =
23. 23.8731 − 3267 =
24. 24.6526 + 8117 =
25. 25.7532 − 2459 =
26. 26.4108 + 6236 =
27. 27.5316 + 5558 =
28. 28.4953 − 2373 =
29. 29.2030 + 4858 =
30. 30.6094 + 5997 =
31. 31.6619 − 2771 =
32. 32.7573 + 6295 =
33. 33.8286 − 7879 =
34. 34.7007 − 3020 =
35. 35.7958 − 6832 =
36. 36.5432 − 3172 =
37. 37.7803 + 5968 =
38. 38.2406 + 8273 =
39. 39.6307 + 2489 =
40. 40.7260 + 8034 =

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