4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 73 · 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. 1.2997 + 8619 =
2. 2.6222 − 5804 =
3. 3.1631 + 3507 =
4. 4.3671 + 6911 =
5. 5.6428 + 6187 =
6. 6.7571 + 6317 =
7. 7.1898 + 1192 =
8. 8.2284 − 2126 =
9. 9.3373 + 2823 =
10. 10.4101 + 2650 =
11. 11.4252 + 5392 =
12. 12.3435 + 2316 =
13. 13.6902 − 2929 =
14. 14.6093 − 4563 =
15. 15.4938 − 4505 =
16. 16.5308 − 4388 =
17. 17.8559 + 1646 =
18. 18.8929 − 3069 =
19. 19.5078 − 1484 =
20. 20.5603 − 5429 =
21. 21.5632 − 2250 =
22. 22.3477 − 2951 =
23. 23.8583 + 3972 =
24. 24.7029 − 1459 =
25. 25.3899 − 2822 =
26. 26.8944 − 1778 =
27. 27.4673 − 2824 =
28. 28.6635 + 8909 =
29. 29.3526 + 3369 =
30. 30.6840 + 1502 =
31. 31.7338 − 1526 =
32. 32.7683 − 6599 =
33. 33.3182 + 1359 =
34. 34.4086 − 3630 =
35. 35.7230 − 4784 =
36. 36.6659 − 5540 =
37. 37.8762 + 8778 =
38. 38.8979 − 5883 =
39. 39.4705 + 8597 =
40. 40.4609 + 5124 =

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