4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 43 · 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. 1.5925 + 2123 =
2. 2.2419 + 7746 =
3. 3.7208 − 5583 =
4. 4.1177 + 4712 =
5. 5.8377 − 2407 =
6. 6.2690 + 6793 =
7. 7.5855 + 4805 =
8. 8.7458 + 7174 =
9. 9.1495 − 1384 =
10. 10.1746 + 4811 =
11. 11.1291 + 8640 =
12. 12.2500 − 2230 =
13. 13.4755 + 6114 =
14. 14.6423 + 7946 =
15. 15.4025 − 1325 =
16. 16.7383 − 1474 =
17. 17.1647 − 1229 =
18. 18.8159 − 7681 =
19. 19.2416 − 2102 =
20. 20.3867 + 2429 =
21. 21.7126 − 1812 =
22. 22.3980 + 8238 =
23. 23.2857 + 5178 =
24. 24.5809 + 7738 =
25. 25.8400 + 2958 =
26. 26.6156 − 6082 =
27. 27.1639 + 5500 =
28. 28.6169 + 6920 =
29. 29.3404 − 1685 =
30. 30.1604 + 4471 =
31. 31.7815 − 7490 =
32. 32.7263 + 5592 =
33. 33.7123 + 3458 =
34. 34.7284 + 3939 =
35. 35.5815 + 4211 =
36. 36.5687 + 8842 =
37. 37.6932 − 4474 =
38. 38.5858 − 4889 =
39. 39.6211 − 1372 =
40. 40.7601 + 2991 =

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