4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 32 · 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. 1.2490 + 2185 =
2. 2.7090 − 3511 =
3. 3.3464 + 2062 =
4. 4.7504 + 1557 =
5. 5.7588 − 2660 =
6. 6.3967 − 2226 =
7. 7.6373 − 4475 =
8. 8.7391 − 1294 =
9. 9.8096 + 2065 =
10. 10.2508 + 8659 =
11. 11.7877 + 7342 =
12. 12.3233 + 3926 =
13. 13.8030 − 5199 =
14. 14.8758 − 6231 =
15. 15.1895 + 6883 =
16. 16.8638 − 6412 =
17. 17.6698 + 5971 =
18. 18.3132 + 7030 =
19. 19.7451 − 5879 =
20. 20.5552 − 1934 =
21. 21.8928 − 3994 =
22. 22.3855 − 2179 =
23. 23.5954 − 3443 =
24. 24.1473 + 1466 =
25. 25.5369 − 4978 =
26. 26.4463 + 7443 =
27. 27.2944 − 2852 =
28. 28.6664 + 6713 =
29. 29.8747 − 7689 =
30. 30.3719 + 6639 =
31. 31.5436 + 4773 =
32. 32.4725 − 3150 =
33. 33.7682 − 2758 =
34. 34.3960 + 8130 =
35. 35.6760 + 1285 =
36. 36.3281 + 5399 =
37. 37.6580 − 2875 =
38. 38.4200 − 2135 =
39. 39.5108 + 4450 =
40. 40.6789 − 2802 =

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