4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 170 · 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. 1.3363 + 6390 =
2. 2.8766 − 4239 =
3. 3.6925 − 3590 =
4. 4.8221 + 7215 =
5. 5.7564 − 3033 =
6. 6.5918 + 2705 =
7. 7.3947 − 2783 =
8. 8.3404 + 6971 =
9. 9.4577 − 3819 =
10. 10.3865 + 5151 =
11. 11.6611 + 4782 =
12. 12.7126 − 6413 =
13. 13.4793 − 3452 =
14. 14.5899 − 3754 =
15. 15.8741 + 3842 =
16. 16.4624 − 4469 =
17. 17.6066 − 1780 =
18. 18.6388 + 4163 =
19. 19.8094 − 1779 =
20. 20.5862 + 8586 =
21. 21.8848 − 5662 =
22. 22.7010 − 1507 =
23. 23.2979 − 2114 =
24. 24.5209 + 3608 =
25. 25.8094 − 6260 =
26. 26.2518 + 8259 =
27. 27.4011 + 8838 =
28. 28.5763 − 2719 =
29. 29.8696 − 1156 =
30. 30.7023 − 5518 =
31. 31.7538 − 5455 =
32. 32.7461 − 1633 =
33. 33.3840 − 3187 =
34. 34.4477 + 7945 =
35. 35.4290 + 4975 =
36. 36.8214 + 4024 =
37. 37.1541 + 6806 =
38. 38.4439 + 7492 =
39. 39.7863 − 1796 =
40. 40.1253 − 1121 =

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