4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 109 · 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. 1.4929 − 2250 =
2. 2.2745 − 1519 =
3. 3.8947 − 2257 =
4. 4.6885 − 5027 =
5. 5.2218 + 6567 =
6. 6.3050 + 4311 =
7. 7.7054 − 3959 =
8. 8.1531 + 8182 =
9. 9.7736 + 8838 =
10. 10.2294 + 5522 =
11. 11.5069 + 2028 =
12. 12.7800 + 1170 =
13. 13.4520 + 8889 =
14. 14.3635 + 5698 =
15. 15.1873 + 3585 =
16. 16.6608 − 2309 =
17. 17.4524 − 3556 =
18. 18.2551 + 6495 =
19. 19.2020 − 1809 =
20. 20.8820 − 6375 =
21. 21.7446 − 1791 =
22. 22.6446 − 4217 =
23. 23.1923 + 5156 =
24. 24.7435 − 5339 =
25. 25.7712 + 1103 =
26. 26.7505 − 7179 =
27. 27.1424 + 6875 =
28. 28.5912 + 4243 =
29. 29.7270 − 2840 =
30. 30.8058 − 5087 =
31. 31.1310 + 5251 =
32. 32.4423 + 4141 =
33. 33.5062 − 4748 =
34. 34.8966 + 4271 =
35. 35.7435 − 3050 =
36. 36.2698 − 1925 =
37. 37.7510 − 2207 =
38. 38.8653 − 6411 =
39. 39.6345 − 1893 =
40. 40.1263 + 7118 =

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