4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 24 · 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. 1.3634 + 8334 =
2. 2.5577 − 3818 =
3. 3.4866 + 1628 =
4. 4.7284 + 2656 =
5. 5.2804 + 8792 =
6. 6.6466 + 4125 =
7. 7.3235 + 2656 =
8. 8.3856 − 2035 =
9. 9.3174 + 1698 =
10. 10.2717 + 7771 =
11. 11.7232 + 3240 =
12. 12.2708 − 2334 =
13. 13.2349 + 1365 =
14. 14.8270 + 7489 =
15. 15.6324 + 2216 =
16. 16.3491 − 1626 =
17. 17.6795 − 5646 =
18. 18.4496 − 3226 =
19. 19.2493 + 4360 =
20. 20.3471 + 6136 =
21. 21.7327 − 2240 =
22. 22.8377 − 1659 =
23. 23.1444 + 6288 =
24. 24.3708 + 2267 =
25. 25.1912 + 2737 =
26. 26.8132 + 4451 =
27. 27.2566 − 1111 =
28. 28.3176 + 2942 =
29. 29.8178 + 1147 =
30. 30.4186 − 1154 =
31. 31.7427 + 4922 =
32. 32.6262 − 5102 =
33. 33.4825 + 5083 =
34. 34.6039 + 6418 =
35. 35.5949 + 8639 =
36. 36.6492 − 4877 =
37. 37.8095 − 5062 =
38. 38.7172 − 5257 =
39. 39.6563 − 1156 =
40. 40.7002 − 2112 =

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