4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 106 · 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. 1.4683 + 5430 =
2. 2.7913 + 8313 =
3. 3.7902 + 5560 =
4. 4.8619 + 7920 =
5. 5.5381 − 2898 =
6. 6.7467 − 2547 =
7. 7.8235 − 4823 =
8. 8.4512 + 5823 =
9. 9.7050 + 1741 =
10. 10.3385 + 8881 =
11. 11.5230 − 3128 =
12. 12.7904 − 6155 =
13. 13.2634 + 4075 =
14. 14.7629 + 7160 =
15. 15.7751 − 3458 =
16. 16.8285 − 2584 =
17. 17.4389 + 1677 =
18. 18.7866 + 8486 =
19. 19.3545 − 2247 =
20. 20.7785 + 1480 =
21. 21.7611 − 7564 =
22. 22.2507 − 1610 =
23. 23.7825 − 6629 =
24. 24.2292 + 8031 =
25. 25.7449 − 6401 =
26. 26.8837 + 3188 =
27. 27.1692 + 4067 =
28. 28.3413 − 2028 =
29. 29.5594 + 4739 =
30. 30.8949 − 1642 =
31. 31.4878 + 1614 =
32. 32.3937 + 1829 =
33. 33.8461 + 2093 =
34. 34.1979 + 6704 =
35. 35.7036 − 6723 =
36. 36.3400 − 2542 =
37. 37.5884 + 4732 =
38. 38.2408 + 8309 =
39. 39.6302 + 5161 =
40. 40.2781 + 2983 =

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