4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 188 · 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. 1.8822 − 8654 =
2. 2.2549 + 3344 =
3. 3.6296 − 1411 =
4. 4.2224 − 2153 =
5. 5.6037 − 4562 =
6. 6.5587 − 2790 =
7. 7.7259 + 5245 =
8. 8.3383 + 5585 =
9. 9.8214 − 5201 =
10. 10.6339 − 2415 =
11. 11.8080 − 1243 =
12. 12.4932 + 4131 =
13. 13.5540 − 5107 =
14. 14.6046 − 2219 =
15. 15.8195 − 1241 =
16. 16.5272 − 4945 =
17. 17.3345 − 2031 =
18. 18.1144 + 2666 =
19. 19.5340 + 8514 =
20. 20.8304 − 2566 =
21. 21.2712 + 1672 =
22. 22.7669 + 6631 =
23. 23.3903 + 4553 =
24. 24.6301 − 4439 =
25. 25.4443 − 1790 =
26. 26.5389 − 3434 =
27. 27.5863 − 2659 =
28. 28.6380 − 2109 =
29. 29.6994 − 2230 =
30. 30.5551 + 3377 =
31. 31.8645 + 6734 =
32. 32.5518 − 3889 =
33. 33.5696 + 4057 =
34. 34.5607 − 2329 =
35. 35.1291 + 5422 =
36. 36.8914 − 4730 =
37. 37.3943 − 2899 =
38. 38.5376 + 5576 =
39. 39.1831 + 2968 =
40. 40.8794 − 1959 =

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