4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 65 · 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. 1.4966 + 7112 =
2. 2.3147 + 6630 =
3. 3.4976 + 6725 =
4. 4.8306 − 7950 =
5. 5.2898 − 1289 =
6. 6.1998 − 1235 =
7. 7.5738 − 3607 =
8. 8.5863 − 1487 =
9. 9.7351 − 4714 =
10. 10.3971 − 3402 =
11. 11.1631 + 3792 =
12. 12.3498 + 7951 =
13. 13.5653 + 2466 =
14. 14.7544 − 1745 =
15. 15.7162 − 3150 =
16. 16.7021 − 1225 =
17. 17.2749 + 5820 =
18. 18.4104 + 5057 =
19. 19.4859 − 2562 =
20. 20.1183 + 2587 =
21. 21.8930 − 4845 =
22. 22.5752 − 4165 =
23. 23.2074 − 1474 =
24. 24.2297 + 5580 =
25. 25.7506 − 1888 =
26. 26.4749 − 3345 =
27. 27.7944 + 5286 =
28. 28.8998 + 3622 =
29. 29.2199 + 3704 =
30. 30.8279 − 1231 =
31. 31.2109 + 5568 =
32. 32.3448 + 3970 =
33. 33.5917 − 3552 =
34. 34.2053 + 6957 =
35. 35.7504 + 8434 =
36. 36.8078 + 2006 =
37. 37.7978 − 2008 =
38. 38.3902 − 1701 =
39. 39.6316 − 1497 =
40. 40.2922 − 2882 =

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