4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 215 · 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. 1.8157 + 4846 =
2. 2.2972 + 1782 =
3. 3.3317 − 2222 =
4. 4.5278 + 7003 =
5. 5.8131 − 4630 =
6. 6.5751 + 2395 =
7. 7.6311 + 8323 =
8. 8.7103 + 6956 =
9. 9.2255 + 7620 =
10. 10.2309 + 7455 =
11. 11.7668 + 1768 =
12. 12.4271 − 2303 =
13. 13.1815 + 4901 =
14. 14.4654 + 2502 =
15. 15.5330 + 2121 =
16. 16.8895 − 7766 =
17. 17.1827 − 1114 =
18. 18.1773 + 4808 =
19. 19.6048 + 3769 =
20. 20.6044 − 1705 =
21. 21.1745 − 1428 =
22. 22.2299 + 1418 =
23. 23.5812 + 4890 =
24. 24.7069 − 4908 =
25. 25.6746 + 3530 =
26. 26.3272 + 8556 =
27. 27.8923 − 8228 =
28. 28.6273 + 7039 =
29. 29.5520 − 3708 =
30. 30.1651 + 1915 =
31. 31.8599 − 1390 =
32. 32.2114 + 5269 =
33. 33.4755 + 4869 =
34. 34.6289 − 1219 =
35. 35.8422 − 3712 =
36. 36.6047 + 1498 =
37. 37.4027 − 1444 =
38. 38.5898 − 4690 =
39. 39.8343 + 6434 =
40. 40.1692 + 8020 =

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