4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 85 · 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. 1.4787 − 4717 =
2. 2.7811 − 4571 =
3. 3.5746 + 8083 =
4. 4.6995 − 5984 =
5. 5.8989 − 7279 =
6. 6.5542 + 4847 =
7. 7.1984 − 1507 =
8. 8.8760 − 5344 =
9. 9.3607 + 8142 =
10. 10.4557 + 1710 =
11. 11.4500 − 3171 =
12. 12.7072 − 5248 =
13. 13.6009 − 1752 =
14. 14.5474 − 3434 =
15. 15.3632 − 3525 =
16. 16.7247 − 1921 =
17. 17.2514 − 1549 =
18. 18.4651 + 7294 =
19. 19.6097 − 5674 =
20. 20.7437 + 7513 =
21. 21.7724 − 1702 =
22. 22.2055 + 7588 =
23. 23.8807 + 3573 =
24. 24.2739 + 5545 =
25. 25.2936 + 6683 =
26. 26.8504 − 5075 =
27. 27.8292 − 1147 =
28. 28.2329 + 1419 =
29. 29.8628 − 4164 =
30. 30.2527 + 4048 =
31. 31.5298 − 1435 =
32. 32.7767 + 6911 =
33. 33.2138 + 8517 =
34. 34.7906 − 5891 =
35. 35.4630 − 1704 =
36. 36.4040 − 1737 =
37. 37.5285 + 6959 =
38. 38.6102 − 5423 =
39. 39.6176 − 3484 =
40. 40.2932 + 6080 =

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