4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 134 · 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. 1.7079 − 4112 =
2. 2.7917 + 4881 =
3. 3.8537 + 4584 =
4. 4.5986 + 5778 =
5. 5.7391 − 1418 =
6. 6.8180 − 3416 =
7. 7.4322 − 1258 =
8. 8.3714 + 2222 =
9. 9.5797 + 1326 =
10. 10.4158 + 5355 =
11. 11.3278 + 8620 =
12. 12.6191 − 4468 =
13. 13.1972 + 5581 =
14. 14.3847 + 2398 =
15. 15.4321 − 2706 =
16. 16.8030 + 5772 =
17. 17.8054 − 4782 =
18. 18.7935 − 6757 =
19. 19.5877 − 5820 =
20. 20.8247 − 5739 =
21. 21.7916 − 2927 =
22. 22.1909 + 3497 =
23. 23.5109 − 2250 =
24. 24.6787 − 4496 =
25. 25.1208 + 1189 =
26. 26.2338 + 2347 =
27. 27.8862 − 3295 =
28. 28.2067 + 7468 =
29. 29.3293 − 1401 =
30. 30.3614 + 2652 =
31. 31.7721 − 1713 =
32. 32.7081 + 8585 =
33. 33.2871 + 3979 =
34. 34.3569 + 6157 =
35. 35.2899 + 7641 =
36. 36.6396 − 4473 =
37. 37.8389 + 7714 =
38. 38.3138 + 4314 =
39. 39.2966 + 4122 =
40. 40.7809 − 1260 =

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