4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 4 · 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. 1.6755 + 3249 =
2. 2.7604 + 2113 =
3. 3.7369 + 4556 =
4. 4.5924 + 2760 =
5. 5.4753 + 8987 =
6. 6.4467 − 3206 =
7. 7.7160 + 1171 =
8. 8.3207 + 6243 =
9. 9.8534 − 7466 =
10. 10.5691 + 8782 =
11. 11.5391 + 1255 =
12. 12.1122 + 7012 =
13. 13.5974 − 2485 =
14. 14.5402 + 2215 =
15. 15.5209 − 3632 =
16. 16.6955 − 4997 =
17. 17.7056 + 8327 =
18. 18.8794 + 7236 =
19. 19.3803 + 5523 =
20. 20.6796 − 3351 =
21. 21.6579 + 1196 =
22. 22.7932 + 7620 =
23. 23.5176 + 5006 =
24. 24.8347 + 7758 =
25. 25.8345 + 8558 =
26. 26.2709 + 2047 =
27. 27.3209 − 2989 =
28. 28.7487 − 3243 =
29. 29.8292 − 6195 =
30. 30.7701 + 2795 =
31. 31.8845 − 4270 =
32. 32.8235 + 4718 =
33. 33.4856 + 1984 =
34. 34.7639 + 3284 =
35. 35.8058 + 4100 =
36. 36.8148 + 8931 =
37. 37.5976 + 8909 =
38. 38.1425 + 3422 =
39. 39.7565 + 8522 =
40. 40.7007 − 3505 =

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