4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 88 · 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. 1.4339 + 4993 =
2. 2.6786 + 8857 =
3. 3.5808 − 5457 =
4. 4.4658 − 2881 =
5. 5.8751 − 2757 =
6. 6.7822 − 2245 =
7. 7.8523 − 5545 =
8. 8.2105 − 1942 =
9. 9.3144 + 6776 =
10. 10.4569 + 4071 =
11. 11.8681 − 6240 =
12. 12.7370 − 4428 =
13. 13.3390 − 3326 =
14. 14.1612 + 2242 =
15. 15.3159 + 6707 =
16. 16.3494 − 1576 =
17. 17.6108 − 4656 =
18. 18.7989 − 2338 =
19. 19.5165 + 5971 =
20. 20.2554 + 1891 =
21. 21.2419 − 1811 =
22. 22.6457 + 7136 =
23. 23.5269 − 5012 =
24. 24.6680 − 1607 =
25. 25.3879 + 5023 =
26. 26.6976 − 6843 =
27. 27.7343 − 4623 =
28. 28.3232 − 3107 =
29. 29.5239 − 1279 =
30. 30.5370 − 3990 =
31. 31.1738 + 5699 =
32. 32.6418 − 3234 =
33. 33.6782 + 7443 =
34. 34.3298 − 2473 =
35. 35.2988 + 8322 =
36. 36.1438 + 3050 =
37. 37.8299 − 3967 =
38. 38.6285 + 8126 =
39. 39.7118 − 1381 =
40. 40.7935 − 3221 =

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