4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 46 · 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. 1.4565 − 1847 =
2. 2.3412 − 2176 =
3. 3.1320 + 2220 =
4. 4.8689 − 4056 =
5. 5.4701 − 1768 =
6. 6.7936 + 2216 =
7. 7.2315 + 7092 =
8. 8.8626 − 7724 =
9. 9.5461 − 4734 =
10. 10.8427 − 2471 =
11. 11.6990 + 6946 =
12. 12.8080 + 7986 =
13. 13.2938 + 4826 =
14. 14.3207 + 3405 =
15. 15.4781 + 6392 =
16. 16.6324 − 6176 =
17. 17.3669 + 4536 =
18. 18.2235 + 7499 =
19. 19.4776 + 1698 =
20. 20.5334 + 7339 =
21. 21.8703 − 2313 =
22. 22.3588 − 2561 =
23. 23.8378 − 3374 =
24. 24.5672 + 2063 =
25. 25.7795 − 1922 =
26. 26.8727 + 5505 =
27. 27.3558 + 3056 =
28. 28.5652 − 5253 =
29. 29.5045 + 5244 =
30. 30.5061 + 8003 =
31. 31.5243 − 2861 =
32. 32.8048 + 3131 =
33. 33.5226 − 3400 =
34. 34.4680 + 4888 =
35. 35.7643 − 3349 =
36. 36.6163 − 2374 =
37. 37.7585 + 1376 =
38. 38.7491 − 5503 =
39. 39.8367 + 7564 =
40. 40.1444 + 1170 =

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