4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 186 · 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. 1.8600 − 2840 =
2. 2.8649 − 6946 =
3. 3.5195 + 7443 =
4. 4.1595 + 3674 =
5. 5.4695 + 1106 =
6. 6.5547 − 4172 =
7. 7.7101 + 3640 =
8. 8.2663 − 2056 =
9. 9.7418 + 4315 =
10. 10.7012 + 7214 =
11. 11.6721 + 7944 =
12. 12.3056 + 2269 =
13. 13.4763 + 5405 =
14. 14.3544 + 1324 =
15. 15.6887 − 3209 =
16. 16.7208 + 4253 =
17. 17.5456 + 6061 =
18. 18.8622 − 1536 =
19. 19.8011 − 4859 =
20. 20.6987 + 5040 =
21. 21.2653 + 8051 =
22. 22.8207 − 6897 =
23. 23.3591 − 2963 =
24. 24.2405 − 1801 =
25. 25.3602 + 6236 =
26. 26.8626 − 6550 =
27. 27.4734 + 7567 =
28. 28.7173 + 6527 =
29. 29.8067 − 3968 =
30. 30.4194 − 2306 =
31. 31.8622 − 3332 =
32. 32.4795 − 1993 =
33. 33.3382 − 3035 =
34. 34.4492 − 4380 =
35. 35.7470 + 7196 =
36. 36.5585 + 7604 =
37. 37.7096 − 3651 =
38. 38.6759 − 2809 =
39. 39.6003 − 2063 =
40. 40.1295 + 7263 =

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