4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 169 · 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. 1.3738 + 8990 =
2. 2.7468 + 6938 =
3. 3.6903 + 1926 =
4. 4.8368 + 5018 =
5. 5.7366 − 1533 =
6. 6.4965 − 2767 =
7. 7.4286 + 6173 =
8. 8.6311 − 3370 =
9. 9.8077 − 7269 =
10. 10.5573 + 1636 =
11. 11.7531 − 2448 =
12. 12.7575 − 2563 =
13. 13.7973 − 6621 =
14. 14.2754 + 3676 =
15. 15.3785 + 6950 =
16. 16.3760 − 2200 =
17. 17.6279 + 8485 =
18. 18.6351 − 2091 =
19. 19.7260 − 4693 =
20. 20.8154 + 2962 =
21. 21.4089 − 1540 =
22. 22.7050 − 6256 =
23. 23.8807 − 1531 =
24. 24.4749 + 7869 =
25. 25.6101 − 2008 =
26. 26.1734 + 3096 =
27. 27.6882 − 1968 =
28. 28.4410 − 3288 =
29. 29.6735 + 4820 =
30. 30.2609 + 4982 =
31. 31.4444 + 5589 =
32. 32.7869 − 2432 =
33. 33.3922 + 2882 =
34. 34.2634 + 8399 =
35. 35.5184 + 6878 =
36. 36.7229 + 4896 =
37. 37.4163 + 7052 =
38. 38.2935 + 2131 =
39. 39.1617 + 7948 =
40. 40.5020 − 4033 =

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