4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 29 · 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. 1.8293 − 2382 =
2. 2.3634 − 1152 =
3. 3.7854 − 3019 =
4. 4.4951 + 4100 =
5. 5.5958 + 6396 =
6. 6.8349 − 2787 =
7. 7.6420 + 3228 =
8. 8.1371 + 2974 =
9. 9.7708 + 8060 =
10. 10.3365 + 5302 =
11. 11.6578 − 4470 =
12. 12.3938 − 1441 =
13. 13.7030 + 4650 =
14. 14.8032 − 2734 =
15. 15.6947 + 3893 =
16. 16.4703 − 1550 =
17. 17.6160 − 2815 =
18. 18.7651 − 2737 =
19. 19.2362 + 6422 =
20. 20.8255 + 4214 =
21. 21.7739 + 5219 =
22. 22.3754 − 1738 =
23. 23.2343 + 3226 =
24. 24.6472 − 4309 =
25. 25.4414 − 1740 =
26. 26.5942 + 2184 =
27. 27.2800 + 1479 =
28. 28.7397 + 6390 =
29. 29.1930 + 5434 =
30. 30.7027 + 8024 =
31. 31.5655 − 2600 =
32. 32.6145 − 1726 =
33. 33.1420 + 4500 =
34. 34.8496 + 6789 =
35. 35.7650 − 6297 =
36. 36.8281 − 7551 =
37. 37.5509 − 4999 =
38. 38.8529 − 4686 =
39. 39.2558 − 1472 =
40. 40.7814 − 3862 =

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