4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 98 · 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. 1.7434 + 6596 =
2. 2.4278 − 4052 =
3. 3.7843 − 3450 =
4. 4.5436 + 5640 =
5. 5.1529 − 1379 =
6. 6.8293 + 6000 =
7. 7.6808 − 3146 =
8. 8.8980 + 2753 =
9. 9.8336 − 4620 =
10. 10.3903 + 2122 =
11. 11.2941 − 1753 =
12. 12.3057 − 2460 =
13. 13.6260 + 4022 =
14. 14.2212 + 4336 =
15. 15.2882 − 1940 =
16. 16.5784 + 4995 =
17. 17.4775 − 1719 =
18. 18.5477 − 2282 =
19. 19.7966 − 5033 =
20. 20.8975 − 2285 =
21. 21.4472 − 1286 =
22. 22.8793 + 4280 =
23. 23.5901 + 5095 =
24. 24.8349 − 6144 =
25. 25.3922 − 2455 =
26. 26.4364 + 7041 =
27. 27.4617 + 3885 =
28. 28.1986 + 2215 =
29. 29.4786 + 3276 =
30. 30.8479 + 1875 =
31. 31.1198 + 4722 =
32. 32.3743 − 1506 =
33. 33.1189 + 2876 =
34. 34.8677 + 8222 =
35. 35.1598 + 2303 =
36. 36.2898 − 1286 =
37. 37.6791 + 2237 =
38. 38.4719 + 6126 =
39. 39.7293 − 4422 =
40. 40.1496 + 1518 =

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