4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 63 · 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. 1.2818 + 8415 =
2. 2.1442 + 6269 =
3. 3.6091 − 1970 =
4. 4.7477 + 5477 =
5. 5.4268 − 3943 =
6. 6.4876 − 4326 =
7. 7.8065 − 7018 =
8. 8.3823 + 1647 =
9. 9.2815 − 2137 =
10. 10.4583 − 2355 =
11. 11.2980 − 1302 =
12. 12.3769 + 8554 =
13. 13.4562 − 4220 =
14. 14.1751 + 5792 =
15. 15.6453 − 4862 =
16. 16.7656 − 3018 =
17. 17.6617 − 4244 =
18. 18.4830 + 4579 =
19. 19.6163 − 2831 =
20. 20.8360 + 2812 =
21. 21.5987 − 5433 =
22. 22.5036 + 3192 =
23. 23.4186 + 4535 =
24. 24.2595 + 8624 =
25. 25.8350 + 4197 =
26. 26.5273 + 3042 =
27. 27.5839 + 1883 =
28. 28.8227 + 4298 =
29. 29.4578 − 3054 =
30. 30.4853 + 5513 =
31. 31.3397 + 6584 =
32. 32.5946 − 2819 =
33. 33.5233 − 1128 =
34. 34.2658 + 2984 =
35. 35.3022 + 1457 =
36. 36.6534 − 2823 =
37. 37.7990 − 6883 =
38. 38.6893 − 3829 =
39. 39.5761 − 2693 =
40. 40.6483 + 5326 =

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