4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 31 · 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. 1.2952 − 1416 =
2. 2.8929 + 2828 =
3. 3.8450 + 8757 =
4. 4.3393 + 1797 =
5. 5.4944 + 3238 =
6. 6.7128 − 2181 =
7. 7.3905 + 2316 =
8. 8.7232 − 1245 =
9. 9.1129 + 6819 =
10. 10.3667 + 4451 =
11. 11.4224 + 6041 =
12. 12.8787 + 3313 =
13. 13.7566 − 2093 =
14. 14.7091 − 4449 =
15. 15.7226 − 1224 =
16. 16.1546 + 5672 =
17. 17.1566 + 3066 =
18. 18.1783 + 2716 =
19. 19.6611 + 6151 =
20. 20.4784 − 4226 =
21. 21.4226 − 1622 =
22. 22.5750 + 3746 =
23. 23.2369 − 2307 =
24. 24.2661 − 2506 =
25. 25.5695 − 3797 =
26. 26.8784 + 6518 =
27. 27.3691 − 3219 =
28. 28.7408 − 1907 =
29. 29.6720 + 8504 =
30. 30.6853 − 4085 =
31. 31.2529 + 3313 =
32. 32.6356 − 3528 =
33. 33.5471 + 7626 =
34. 34.4394 − 3200 =
35. 35.5104 − 2508 =
36. 36.6500 − 3069 =
37. 37.3150 + 7218 =
38. 38.1918 + 7012 =
39. 39.6872 − 2196 =
40. 40.3127 + 8323 =

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