4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 66 · 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. 1.7570 + 8156 =
2. 2.4107 − 2435 =
3. 3.8667 − 1719 =
4. 4.8805 − 5671 =
5. 5.2165 + 8690 =
6. 6.8583 − 1115 =
7. 7.1616 + 6835 =
8. 8.4421 + 5330 =
9. 9.8142 − 6110 =
10. 10.2390 − 1315 =
11. 11.2382 − 1651 =
12. 12.1222 + 4918 =
13. 13.4867 − 3033 =
14. 14.4672 + 3747 =
15. 15.6240 − 4045 =
16. 16.6607 − 2654 =
17. 17.1685 + 2719 =
18. 18.5199 − 5155 =
19. 19.6532 + 4260 =
20. 20.5475 + 8284 =
21. 21.8118 − 2958 =
22. 22.4487 − 1850 =
23. 23.3209 + 7802 =
24. 24.7049 + 6467 =
25. 25.3782 − 3291 =
26. 26.2826 + 5134 =
27. 27.4063 − 2123 =
28. 28.3538 + 4408 =
29. 29.8628 + 3101 =
30. 30.3749 − 3739 =
31. 31.2782 + 1229 =
32. 32.6714 + 3682 =
33. 33.1146 + 4517 =
34. 34.8649 − 2199 =
35. 35.5286 + 5663 =
36. 36.4512 − 3377 =
37. 37.1963 + 5234 =
38. 38.8294 + 3475 =
39. 39.4545 + 8199 =
40. 40.5431 − 4254 =

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