4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 49 · 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. 1.8581 + 3703 =
2. 2.8273 + 8344 =
3. 3.1461 + 8276 =
4. 4.5530 + 1838 =
5. 5.3683 + 4469 =
6. 6.6012 − 1454 =
7. 7.3272 + 3012 =
8. 8.7759 − 7388 =
9. 9.6272 − 1258 =
10. 10.4764 − 1843 =
11. 11.5919 − 4679 =
12. 12.3657 + 1764 =
13. 13.8282 + 4684 =
14. 14.8176 + 5341 =
15. 15.8340 − 4415 =
16. 16.3310 + 2827 =
17. 17.4022 − 3082 =
18. 18.2232 − 1850 =
19. 19.8860 − 2506 =
20. 20.3882 + 6619 =
21. 21.7541 − 2874 =
22. 22.2034 + 6159 =
23. 23.3096 + 2223 =
24. 24.8179 − 4346 =
25. 25.7866 + 2009 =
26. 26.1598 − 1596 =
27. 27.6978 + 2715 =
28. 28.5747 + 5560 =
29. 29.2823 + 6865 =
30. 30.5839 − 2383 =
31. 31.1698 + 1582 =
32. 32.1290 + 1933 =
33. 33.4991 + 7154 =
34. 34.5202 − 5194 =
35. 35.2250 + 3534 =
36. 36.2324 − 1333 =
37. 37.5806 − 4124 =
38. 38.3177 − 1354 =
39. 39.4975 + 2885 =
40. 40.4405 − 3049 =

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