4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 75 · 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. 1.3546 − 3398 =
2. 2.1288 + 3175 =
3. 3.2977 + 2904 =
4. 4.8409 − 3764 =
5. 5.5779 − 4174 =
6. 6.5723 − 4851 =
7. 7.5164 − 4192 =
8. 8.4678 − 2024 =
9. 9.6598 − 1825 =
10. 10.7024 + 3309 =
11. 11.1793 − 1535 =
12. 12.7170 − 1559 =
13. 13.6429 − 3250 =
14. 14.5004 + 7844 =
15. 15.7447 − 3660 =
16. 16.4808 − 3673 =
17. 17.8388 + 3339 =
18. 18.2237 − 1782 =
19. 19.8596 + 4931 =
20. 20.5037 − 3460 =
21. 21.6803 − 1464 =
22. 22.3406 + 8272 =
23. 23.3131 + 3703 =
24. 24.8395 + 5796 =
25. 25.2816 − 1909 =
26. 26.1889 + 3657 =
27. 27.4964 − 4341 =
28. 28.6140 − 4292 =
29. 29.3195 + 7688 =
30. 30.8685 + 1264 =
31. 31.7290 − 3959 =
32. 32.4264 − 2370 =
33. 33.2675 + 1859 =
34. 34.8569 + 3115 =
35. 35.5737 + 4429 =
36. 36.6791 − 5097 =
37. 37.4641 + 8285 =
38. 38.6511 − 4364 =
39. 39.7216 + 3571 =
40. 40.1401 − 1135 =

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