4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 163 · 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. 1.6880 − 3713 =
2. 2.8820 − 5048 =
3. 3.3218 + 1982 =
4. 4.4123 − 1526 =
5. 5.7355 + 6739 =
6. 6.3866 + 1268 =
7. 7.2763 + 2495 =
8. 8.7692 + 6926 =
9. 9.3318 + 6151 =
10. 10.6204 + 3623 =
11. 11.2283 + 5492 =
12. 12.6295 − 2917 =
13. 13.8855 − 6187 =
14. 14.2295 − 2196 =
15. 15.3422 + 8798 =
16. 16.4168 + 7356 =
17. 17.5136 + 3713 =
18. 18.4309 + 6158 =
19. 19.3819 + 4258 =
20. 20.3884 − 3093 =
21. 21.6239 + 5742 =
22. 22.3579 + 2791 =
23. 23.2454 + 4554 =
24. 24.7139 + 3457 =
25. 25.3266 + 3197 =
26. 26.1992 + 5202 =
27. 27.6164 − 1694 =
28. 28.4743 + 3407 =
29. 29.5333 − 2084 =
30. 30.1840 + 8319 =
31. 31.2024 + 8240 =
32. 32.7918 + 7660 =
33. 33.8845 + 3414 =
34. 34.8993 + 5300 =
35. 35.3910 − 3369 =
36. 36.3145 + 6844 =
37. 37.6450 + 6425 =
38. 38.8348 − 3390 =
39. 39.7972 − 7008 =
40. 40.7860 − 1282 =

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