4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 57 · 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. 1.2423 + 5782 =
2. 2.6842 − 1838 =
3. 3.7556 − 3194 =
4. 4.5687 + 8389 =
5. 5.4259 + 8543 =
6. 6.8200 − 6674 =
7. 7.5230 + 2261 =
8. 8.2940 + 7810 =
9. 9.8609 + 2610 =
10. 10.2734 + 8167 =
11. 11.7052 − 2070 =
12. 12.8293 − 5130 =
13. 13.4031 − 2582 =
14. 14.5246 − 2464 =
15. 15.3662 + 6463 =
16. 16.3375 + 2030 =
17. 17.7037 − 6198 =
18. 18.5252 + 6644 =
19. 19.6489 + 3128 =
20. 20.8743 − 5617 =
21. 21.6416 − 2568 =
22. 22.7058 + 1221 =
23. 23.4097 − 2327 =
24. 24.2799 − 2273 =
25. 25.3094 + 6214 =
26. 26.6110 − 3058 =
27. 27.5189 − 4446 =
28. 28.5520 + 8919 =
29. 29.8437 + 1138 =
30. 30.2238 + 5303 =
31. 31.2535 + 3575 =
32. 32.5045 + 6362 =
33. 33.6948 + 7404 =
34. 34.4255 − 2550 =
35. 35.8138 + 6099 =
36. 36.1542 − 1354 =
37. 37.7657 + 6550 =
38. 38.6877 + 3360 =
39. 39.4427 + 2891 =
40. 40.3247 − 2180 =

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