4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 91 · 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. 1.2404 + 8510 =
2. 2.7468 − 2393 =
3. 3.3892 + 7374 =
4. 4.7718 − 1864 =
5. 5.6485 − 1329 =
6. 6.7389 + 1298 =
7. 7.4769 − 2418 =
8. 8.5596 + 6839 =
9. 9.1324 − 1238 =
10. 10.8723 − 7107 =
11. 11.6058 − 3111 =
12. 12.3832 − 2373 =
13. 13.2344 + 1134 =
14. 14.7835 + 3606 =
15. 15.5378 + 3251 =
16. 16.8941 − 5788 =
17. 17.5901 + 4066 =
18. 18.1289 + 2776 =
19. 19.8903 + 7987 =
20. 20.2896 + 1142 =
21. 21.2019 + 1426 =
22. 22.3267 − 1602 =
23. 23.6468 − 4520 =
24. 24.6110 − 4935 =
25. 25.7917 − 5634 =
26. 26.5593 + 8887 =
27. 27.5729 + 2635 =
28. 28.2203 − 1454 =
29. 29.1972 + 7551 =
30. 30.6622 + 3299 =
31. 31.1398 + 1143 =
32. 32.2067 + 4965 =
33. 33.7446 + 4541 =
34. 34.7496 − 5056 =
35. 35.3695 − 1878 =
36. 36.8369 + 7276 =
37. 37.5453 − 4848 =
38. 38.5801 − 3717 =
39. 39.5255 + 4866 =
40. 40.5997 + 3913 =

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