4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 64 · 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. 1.3899 + 5891 =
2. 2.6279 + 4899 =
3. 3.2776 + 3433 =
4. 4.6373 − 6154 =
5. 5.8704 + 8852 =
6. 6.5578 + 2299 =
7. 7.7496 − 2164 =
8. 8.4583 − 1666 =
9. 9.3148 + 1147 =
10. 10.6533 − 1151 =
11. 11.3306 + 5799 =
12. 12.8038 − 4717 =
13. 13.2148 − 1519 =
14. 14.2632 − 1140 =
15. 15.6856 − 1843 =
16. 16.5396 − 3219 =
17. 17.3235 + 6953 =
18. 18.2581 + 2229 =
19. 19.7585 + 7090 =
20. 20.7918 + 3379 =
21. 21.5862 + 8688 =
22. 22.5088 − 4931 =
23. 23.6355 − 3652 =
24. 24.3629 − 3060 =
25. 25.8648 − 6183 =
26. 26.2664 − 1679 =
27. 27.8498 − 7331 =
28. 28.1148 + 3068 =
29. 29.8891 − 4837 =
30. 30.1324 + 8650 =
31. 31.3717 + 2649 =
32. 32.1536 − 1436 =
33. 33.5440 + 2849 =
34. 34.8624 + 6128 =
35. 35.8286 + 3084 =
36. 36.4216 + 4349 =
37. 37.5481 + 4129 =
38. 38.8394 − 6609 =
39. 39.4288 − 1928 =
40. 40.1438 + 3211 =

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