4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 102 · 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. 1.6407 − 4374 =
2. 2.6431 + 2502 =
3. 3.2424 + 5733 =
4. 4.8030 − 2385 =
5. 5.4515 − 2866 =
6. 6.7666 − 3615 =
7. 7.6211 − 5457 =
8. 8.8962 − 3290 =
9. 9.4147 + 1301 =
10. 10.6895 + 2268 =
11. 11.1404 + 8153 =
12. 12.6004 − 5640 =
13. 13.4619 − 2259 =
14. 14.6946 + 5557 =
15. 15.3112 + 4196 =
16. 16.6769 − 5767 =
17. 17.3650 + 5078 =
18. 18.8061 − 2558 =
19. 19.4713 − 1180 =
20. 20.3862 + 1431 =
21. 21.8662 − 4657 =
22. 22.3270 − 1334 =
23. 23.8500 + 6820 =
24. 24.2732 + 8483 =
25. 25.6644 − 4161 =
26. 26.7223 − 7222 =
27. 27.1145 + 4363 =
28. 28.3321 − 2178 =
29. 29.7766 − 1371 =
30. 30.8030 − 7582 =
31. 31.6643 − 1379 =
32. 32.1424 + 4721 =
33. 33.3689 + 4873 =
34. 34.2548 − 1907 =
35. 35.7865 − 3055 =
36. 36.3445 + 1815 =
37. 37.4220 − 1888 =
38. 38.8726 − 1592 =
39. 39.6091 + 6701 =
40. 40.2810 + 3087 =

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