4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 99 · 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. 1.4250 + 4131 =
2. 2.4219 + 6432 =
3. 3.3836 + 4236 =
4. 4.7528 − 3155 =
5. 5.4977 + 4702 =
6. 6.6174 + 7825 =
7. 7.8693 − 7607 =
8. 8.8795 + 5792 =
9. 9.6966 + 7594 =
10. 10.4788 + 5100 =
11. 11.3555 − 1418 =
12. 12.3392 + 1658 =
13. 13.8912 − 1497 =
14. 14.5719 + 2193 =
15. 15.4790 − 3573 =
16. 16.6839 + 8567 =
17. 17.7502 − 6236 =
18. 18.7295 − 1893 =
19. 19.7046 + 4121 =
20. 20.3986 + 7534 =
21. 21.1387 + 7556 =
22. 22.3026 − 2666 =
23. 23.7327 − 4766 =
24. 24.8102 + 2997 =
25. 25.5695 + 2289 =
26. 26.3093 + 6305 =
27. 27.7365 − 6961 =
28. 28.5544 + 2353 =
29. 29.8477 + 2152 =
30. 30.1683 + 5980 =
31. 31.7618 + 1923 =
32. 32.2549 + 6707 =
33. 33.7601 − 5256 =
34. 34.8702 − 4142 =
35. 35.4292 − 2993 =
36. 36.8241 − 7171 =
37. 37.8885 − 2776 =
38. 38.8034 + 8521 =
39. 39.2029 + 1839 =
40. 40.6485 + 6647 =

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