4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 130 · 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. 1.8816 − 7297 =
2. 2.6255 + 8402 =
3. 3.1672 + 2562 =
4. 4.4004 + 8992 =
5. 5.4975 + 5937 =
6. 6.7912 − 5409 =
7. 7.6074 − 1114 =
8. 8.3605 − 2019 =
9. 9.6679 + 5540 =
10. 10.8553 − 3322 =
11. 11.8351 − 7063 =
12. 12.8923 + 5471 =
13. 13.4187 + 4238 =
14. 14.4249 + 1720 =
15. 15.7116 + 1969 =
16. 16.2968 + 1974 =
17. 17.2018 + 5708 =
18. 18.8522 + 1332 =
19. 19.4262 − 3080 =
20. 20.2272 + 4259 =
21. 21.3200 + 2671 =
22. 22.2546 + 8953 =
23. 23.8443 − 2920 =
24. 24.6885 − 5893 =
25. 25.3549 + 2655 =
26. 26.2687 − 1892 =
27. 27.2826 + 6777 =
28. 28.8318 − 2699 =
29. 29.4551 + 7371 =
30. 30.5659 + 2855 =
31. 31.7806 − 1743 =
32. 32.1172 + 4100 =
33. 33.3459 + 4299 =
34. 34.6381 + 4757 =
35. 35.7095 − 3101 =
36. 36.8664 − 2913 =
37. 37.2911 + 2522 =
38. 38.2423 + 2971 =
39. 39.2561 + 7727 =
40. 40.8182 − 1839 =

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