4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 23 · 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. 1.3087 − 1243 =
2. 2.7756 + 3188 =
3. 3.1767 + 5700 =
4. 4.8405 + 7691 =
5. 5.5593 + 7217 =
6. 6.3832 − 2089 =
7. 7.3134 + 3504 =
8. 8.8250 + 4157 =
9. 9.6092 − 4318 =
10. 10.8218 − 4907 =
11. 11.1512 − 1352 =
12. 12.3184 + 1901 =
13. 13.8517 + 2635 =
14. 14.4039 + 7026 =
15. 15.5501 + 3140 =
16. 16.6997 − 1494 =
17. 17.4613 + 8238 =
18. 18.8273 + 2127 =
19. 19.7602 − 6951 =
20. 20.3175 − 2100 =
21. 21.6325 − 1982 =
22. 22.5215 − 1156 =
23. 23.4528 − 4506 =
24. 24.8490 − 1463 =
25. 25.5305 + 2358 =
26. 26.4706 − 3787 =
27. 27.6454 − 4790 =
28. 28.5025 − 4631 =
29. 29.3167 + 1676 =
30. 30.6550 − 4263 =
31. 31.2739 + 8676 =
32. 32.4976 − 4077 =
33. 33.5464 − 2601 =
34. 34.3599 + 6957 =
35. 35.5981 − 3090 =
36. 36.7810 − 7173 =
37. 37.8405 − 5053 =
38. 38.4920 + 3258 =
39. 39.4549 − 2909 =
40. 40.4240 − 2210 =

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