4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 135 · 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. 1.7464 − 1896 =
2. 2.8362 − 1269 =
3. 3.4442 + 3165 =
4. 4.2471 + 1374 =
5. 5.8394 − 1797 =
6. 6.7350 + 3619 =
7. 7.4045 + 8588 =
8. 8.2945 + 1199 =
9. 9.8536 − 3457 =
10. 10.3129 + 7263 =
11. 11.8604 + 2342 =
12. 12.3567 + 4467 =
13. 13.4465 + 4228 =
14. 14.5883 − 1966 =
15. 15.2031 + 2917 =
16. 16.5429 + 8760 =
17. 17.5590 − 1786 =
18. 18.2970 − 1436 =
19. 19.1354 + 3882 =
20. 20.1527 + 7785 =
21. 21.5726 − 4221 =
22. 22.8785 + 3038 =
23. 23.8311 + 7316 =
24. 24.5361 − 2011 =
25. 25.1767 + 7668 =
26. 26.5811 + 8071 =
27. 27.4960 + 2575 =
28. 28.3840 + 3388 =
29. 29.6537 + 6403 =
30. 30.6191 + 6087 =
31. 31.7775 + 8683 =
32. 32.6651 + 4102 =
33. 33.6093 − 1915 =
34. 34.6472 − 2737 =
35. 35.8931 − 3869 =
36. 36.8839 + 3170 =
37. 37.7921 + 7626 =
38. 38.4444 + 2035 =
39. 39.7998 − 1719 =
40. 40.6223 − 5689 =

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