4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 197 · 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. 1.5843 − 5143 =
2. 2.1310 + 4280 =
3. 3.2106 + 3921 =
4. 4.7643 − 2040 =
5. 5.8959 − 3914 =
6. 6.8946 + 2050 =
7. 7.6558 − 1862 =
8. 8.4845 + 5285 =
9. 9.6253 − 2365 =
10. 10.4046 + 6158 =
11. 11.8282 + 8636 =
12. 12.6357 − 1699 =
13. 13.5392 − 1189 =
14. 14.5002 − 2405 =
15. 15.5104 − 2119 =
16. 16.3733 − 2790 =
17. 17.5217 − 5066 =
18. 18.2125 − 1249 =
19. 19.7648 − 1875 =
20. 20.4164 − 3818 =
21. 21.8325 − 5630 =
22. 22.8969 + 4869 =
23. 23.6428 − 3283 =
24. 24.7159 + 5508 =
25. 25.8862 + 5009 =
26. 26.8554 + 6567 =
27. 27.1197 + 2021 =
28. 28.8603 − 2203 =
29. 29.2266 + 7188 =
30. 30.5631 − 5093 =
31. 31.5899 + 4098 =
32. 32.8417 + 7608 =
33. 33.8752 − 1658 =
34. 34.8959 − 1745 =
35. 35.1192 + 7294 =
36. 36.4225 + 1517 =
37. 37.2261 + 4483 =
38. 38.7717 − 4781 =
39. 39.2601 − 1418 =
40. 40.7771 − 6507 =

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