4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 20 · 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. 1.5822 + 4129 =
2. 2.3112 − 2458 =
3. 3.4593 + 5903 =
4. 4.8259 − 6281 =
5. 5.5254 − 5149 =
6. 6.2645 − 1865 =
7. 7.7859 − 4871 =
8. 8.3781 − 1766 =
9. 9.8532 − 1891 =
10. 10.8758 − 8496 =
11. 11.6851 + 4631 =
12. 12.4273 + 3401 =
13. 13.4695 − 1276 =
14. 14.5453 + 4016 =
15. 15.3144 − 2855 =
16. 16.6932 − 3453 =
17. 17.1196 + 6006 =
18. 18.4954 − 3419 =
19. 19.2394 + 5846 =
20. 20.5784 − 3326 =
21. 21.2655 + 3158 =
22. 22.8613 − 2587 =
23. 23.3495 + 4881 =
24. 24.8381 − 7479 =
25. 25.4565 − 1955 =
26. 26.5563 + 6190 =
27. 27.2805 + 3650 =
28. 28.8438 − 2689 =
29. 29.8005 − 5548 =
30. 30.6194 + 4656 =
31. 31.6632 + 1724 =
32. 32.1143 + 4184 =
33. 33.5507 − 1898 =
34. 34.3214 + 1253 =
35. 35.5000 − 3121 =
36. 36.8388 + 4849 =
37. 37.7320 + 8090 =
38. 38.7879 − 5689 =
39. 39.4603 − 2406 =
40. 40.8329 − 6253 =

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