4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 50 · 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. 1.5738 + 7163 =
2. 2.3716 + 5266 =
3. 3.8613 + 1329 =
4. 4.8413 + 7230 =
5. 5.3842 + 5179 =
6. 6.2447 + 1675 =
7. 7.5885 − 2755 =
8. 8.1165 + 5937 =
9. 9.8334 + 1896 =
10. 10.6608 + 1431 =
11. 11.7479 + 4259 =
12. 12.8707 + 2816 =
13. 13.2841 − 2754 =
14. 14.3781 + 8861 =
15. 15.8482 − 3254 =
16. 16.1406 + 5324 =
17. 17.4723 + 1281 =
18. 18.7011 + 6653 =
19. 19.8025 + 8345 =
20. 20.6939 − 5894 =
21. 21.7496 + 2336 =
22. 22.7085 − 1405 =
23. 23.6893 − 6887 =
24. 24.4071 − 1431 =
25. 25.6952 − 5756 =
26. 26.3393 + 5694 =
27. 27.2434 + 5942 =
28. 28.4894 − 3526 =
29. 29.8926 − 1440 =
30. 30.7436 + 1933 =
31. 31.7422 + 7694 =
32. 32.5787 + 6976 =
33. 33.2923 − 2452 =
34. 34.5088 + 4813 =
35. 35.8099 − 4264 =
36. 36.5244 + 6572 =
37. 37.4229 + 2498 =
38. 38.7657 − 3675 =
39. 39.7305 + 5322 =
40. 40.6320 − 1370 =

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