4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 164 · 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. 1.5287 − 1431 =
2. 2.6849 − 4928 =
3. 3.5739 + 4960 =
4. 4.6771 + 2955 =
5. 5.8734 − 4514 =
6. 6.3658 − 1215 =
7. 7.1759 + 3327 =
8. 8.2445 + 1427 =
9. 9.6594 − 3306 =
10. 10.7524 − 1238 =
11. 11.2023 + 2481 =
12. 12.8342 − 3231 =
13. 13.6639 + 1235 =
14. 14.7324 − 3015 =
15. 15.2823 + 1168 =
16. 16.7267 − 7140 =
17. 17.8694 − 1416 =
18. 18.8306 − 1951 =
19. 19.8987 − 4314 =
20. 20.1861 + 3778 =
21. 21.8696 + 7071 =
22. 22.5845 + 1562 =
23. 23.3637 + 6772 =
24. 24.7914 − 6219 =
25. 25.8306 − 6623 =
26. 26.1903 + 7624 =
27. 27.2493 + 4371 =
28. 28.6346 + 4475 =
29. 29.7529 + 8751 =
30. 30.4850 + 1441 =
31. 31.1974 + 4956 =
32. 32.6372 + 1974 =
33. 33.1907 + 5831 =
34. 34.7970 − 3269 =
35. 35.6095 − 1254 =
36. 36.5449 + 6930 =
37. 37.3278 − 1885 =
38. 38.4248 + 5156 =
39. 39.6742 + 2143 =
40. 40.8458 − 3981 =

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