4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 97 · 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. 1.6201 + 5007 =
2. 2.4476 − 1907 =
3. 3.4212 + 6943 =
4. 4.8370 + 3888 =
5. 5.5776 − 1186 =
6. 6.1141 + 8441 =
7. 7.4478 + 2950 =
8. 8.5395 + 5716 =
9. 9.2542 + 2046 =
10. 10.8668 − 3298 =
11. 11.3067 + 4700 =
12. 12.5514 − 4389 =
13. 13.4608 − 3642 =
14. 14.8321 − 2692 =
15. 15.3018 − 1370 =
16. 16.3235 + 5143 =
17. 17.5423 + 7644 =
18. 18.5992 − 5241 =
19. 19.7590 + 1959 =
20. 20.2642 + 7172 =
21. 21.2565 + 3125 =
22. 22.6815 + 5093 =
23. 23.2310 + 6099 =
24. 24.2354 − 1241 =
25. 25.7295 + 4060 =
26. 26.4405 + 3825 =
27. 27.6192 − 1158 =
28. 28.3593 + 5646 =
29. 29.8960 − 2847 =
30. 30.8649 + 7881 =
31. 31.2305 + 1161 =
32. 32.5875 − 2645 =
33. 33.3320 + 6370 =
34. 34.5706 − 3364 =
35. 35.6612 − 5390 =
36. 36.8065 − 1937 =
37. 37.7133 − 4792 =
38. 38.5056 − 2926 =
39. 39.8971 − 3942 =
40. 40.7619 + 5874 =

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