4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 108 · 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. 1.7544 − 1636 =
2. 2.7794 + 7384 =
3. 3.4064 − 2851 =
4. 4.7535 − 2812 =
5. 5.7714 − 4414 =
6. 6.3260 + 8634 =
7. 7.7623 − 3434 =
8. 8.3916 + 2621 =
9. 9.6882 − 5472 =
10. 10.7774 + 1669 =
11. 11.1494 + 2714 =
12. 12.1625 + 4705 =
13. 13.5328 + 3261 =
14. 14.6475 − 1193 =
15. 15.4124 − 3857 =
16. 16.8198 + 2823 =
17. 17.8472 − 5020 =
18. 18.3325 + 8122 =
19. 19.7563 + 5316 =
20. 20.3923 + 4320 =
21. 21.8991 − 8845 =
22. 22.7843 − 6479 =
23. 23.7226 + 4645 =
24. 24.3595 + 4253 =
25. 25.3690 + 3395 =
26. 26.7394 − 6616 =
27. 27.2311 − 1486 =
28. 28.2954 + 1507 =
29. 29.8748 + 3124 =
30. 30.2405 + 6587 =
31. 31.5973 + 3197 =
32. 32.1250 − 1171 =
33. 33.8198 − 8155 =
34. 34.4101 − 1831 =
35. 35.5515 − 2177 =
36. 36.7595 + 2251 =
37. 37.8341 + 5812 =
38. 38.6693 − 1316 =
39. 39.3077 + 1323 =
40. 40.2880 + 6704 =

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