4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 87 · 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. 1.8945 − 6054 =
2. 2.4538 − 4187 =
3. 3.4816 − 2548 =
4. 4.1909 − 1329 =
5. 5.5740 + 5757 =
6. 6.4696 − 2562 =
7. 7.7233 + 5413 =
8. 8.6850 + 7699 =
9. 9.4229 − 3212 =
10. 10.3444 − 2120 =
11. 11.5981 + 8742 =
12. 12.2638 + 4730 =
13. 13.7377 − 6212 =
14. 14.3841 + 8210 =
15. 15.7498 − 7496 =
16. 16.7723 − 4894 =
17. 17.6572 + 7030 =
18. 18.1465 + 7998 =
19. 19.8216 + 6564 =
20. 20.8958 − 5508 =
21. 21.7748 − 5369 =
22. 22.2510 + 3205 =
23. 23.7472 + 5162 =
24. 24.6347 + 4951 =
25. 25.1369 + 1776 =
26. 26.4704 + 4337 =
27. 27.3743 + 6310 =
28. 28.7417 − 3581 =
29. 29.6258 + 7440 =
30. 30.2938 + 7482 =
31. 31.5373 + 3730 =
32. 32.8631 + 8671 =
33. 33.3704 + 8408 =
34. 34.2752 − 2037 =
35. 35.7280 − 2244 =
36. 36.2947 + 3879 =
37. 37.2118 + 5416 =
38. 38.8244 + 2287 =
39. 39.5341 + 1526 =
40. 40.7260 + 1485 =

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