4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 142 · 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. 1.4843 − 1307 =
2. 2.7308 − 1372 =
3. 3.5870 − 2934 =
4. 4.8937 − 2580 =
5. 5.2589 + 2683 =
6. 6.2660 + 5657 =
7. 7.8026 − 1129 =
8. 8.7106 + 1780 =
9. 9.1597 + 6648 =
10. 10.3643 + 8658 =
11. 11.1469 + 1205 =
12. 12.4416 + 7484 =
13. 13.4492 + 6432 =
14. 14.3090 + 5907 =
15. 15.4994 − 3318 =
16. 16.4228 − 4111 =
17. 17.7188 − 3255 =
18. 18.4349 + 7033 =
19. 19.2939 + 5392 =
20. 20.4650 + 8642 =
21. 21.1184 + 7619 =
22. 22.6240 + 4238 =
23. 23.4934 + 5921 =
24. 24.7274 + 7572 =
25. 25.7445 + 5335 =
26. 26.7136 + 6060 =
27. 27.6347 − 4084 =
28. 28.8115 − 6827 =
29. 29.4899 + 7103 =
30. 30.7035 − 2180 =
31. 31.7985 − 6645 =
32. 32.4808 − 3554 =
33. 33.1856 − 1139 =
34. 34.5316 − 4609 =
35. 35.5144 + 8535 =
36. 36.5413 + 6093 =
37. 37.3555 + 6165 =
38. 38.4611 + 6461 =
39. 39.8389 − 7318 =
40. 40.7108 + 8326 =

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