4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 206 · 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. 1.7532 + 8421 =
2. 2.8148 − 2164 =
3. 3.6041 + 1465 =
4. 4.2101 + 8209 =
5. 5.4250 − 2721 =
6. 6.3175 + 4927 =
7. 7.5601 − 3320 =
8. 8.1341 + 7945 =
9. 9.7201 + 3234 =
10. 10.5131 − 4784 =
11. 11.6410 + 2327 =
12. 12.1844 + 5467 =
13. 13.6339 + 1438 =
14. 14.7668 − 7078 =
15. 15.3851 − 1406 =
16. 16.7748 − 3140 =
17. 17.7383 + 3327 =
18. 18.8643 − 5075 =
19. 19.2780 + 5873 =
20. 20.8828 + 3530 =
21. 21.8631 + 1181 =
22. 22.7571 + 8665 =
23. 23.4999 + 1516 =
24. 24.6749 + 2821 =
25. 25.7591 + 2799 =
26. 26.5687 + 3060 =
27. 27.7571 − 1410 =
28. 28.2071 + 1712 =
29. 29.6612 − 1118 =
30. 30.6706 − 6386 =
31. 31.3777 + 3684 =
32. 32.5067 + 8116 =
33. 33.8728 − 7554 =
34. 34.5530 + 3986 =
35. 35.5930 − 3279 =
36. 36.6323 − 3348 =
37. 37.8759 + 2936 =
38. 38.6636 − 3958 =
39. 39.1839 + 6127 =
40. 40.8278 − 4581 =

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