4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 139 · 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. 1.3555 − 3440 =
2. 2.1816 + 2237 =
3. 3.7759 + 6980 =
4. 4.4765 + 2435 =
5. 5.5461 + 8057 =
6. 6.8750 + 8780 =
7. 7.8232 + 4229 =
8. 8.6494 + 1329 =
9. 9.1565 + 5246 =
10. 10.5957 + 2059 =
11. 11.3893 + 2712 =
12. 12.6776 − 2871 =
13. 13.1866 + 5939 =
14. 14.4909 + 7442 =
15. 15.2674 − 2037 =
16. 16.8330 − 3851 =
17. 17.7068 − 4008 =
18. 18.7584 − 4177 =
19. 19.8263 + 5452 =
20. 20.8467 − 7697 =
21. 21.7170 − 4748 =
22. 22.8392 − 7167 =
23. 23.4962 + 8945 =
24. 24.2696 + 7276 =
25. 25.2244 + 4902 =
26. 26.2938 + 1466 =
27. 27.3913 − 1205 =
28. 28.7277 + 8654 =
29. 29.2464 + 7991 =
30. 30.3952 − 3802 =
31. 31.8127 − 5422 =
32. 32.8496 + 6827 =
33. 33.6332 + 6493 =
34. 34.7829 − 3473 =
35. 35.7468 + 3545 =
36. 36.3430 − 2406 =
37. 37.6034 + 6774 =
38. 38.5136 − 3813 =
39. 39.8905 − 1286 =
40. 40.1604 + 6246 =

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