4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 28 · 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. 1.8274 + 5725 =
2. 2.5915 − 4986 =
3. 3.8813 − 6623 =
4. 4.1222 + 8242 =
5. 5.7972 + 3273 =
6. 6.8535 + 1871 =
7. 7.5684 + 8471 =
8. 8.6635 − 3092 =
9. 9.7550 − 5572 =
10. 10.5769 + 2358 =
11. 11.5046 − 1662 =
12. 12.6935 + 3102 =
13. 13.5090 − 2344 =
14. 14.5167 − 3708 =
15. 15.6908 − 2336 =
16. 16.5922 + 1148 =
17. 17.8457 + 4486 =
18. 18.8733 − 4480 =
19. 19.3904 + 4052 =
20. 20.8302 − 3192 =
21. 21.7795 + 3013 =
22. 22.8039 − 3930 =
23. 23.5264 + 1913 =
24. 24.6515 + 6705 =
25. 25.2468 + 4107 =
26. 26.6563 + 7701 =
27. 27.7172 + 6148 =
28. 28.7524 − 7203 =
29. 29.7185 + 2859 =
30. 30.1507 + 1317 =
31. 31.7223 − 4314 =
32. 32.4971 + 5985 =
33. 33.4053 + 3044 =
34. 34.5815 − 1114 =
35. 35.5791 + 3583 =
36. 36.5754 + 6403 =
37. 37.8044 − 3917 =
38. 38.8293 + 1927 =
39. 39.2821 + 2059 =
40. 40.8648 − 5047 =

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