4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 39 · 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. 1.6994 + 6390 =
2. 2.6006 − 1289 =
3. 3.7643 + 4248 =
4. 4.3218 + 7989 =
5. 5.1792 + 5228 =
6. 6.5167 − 4571 =
7. 7.8756 − 5904 =
8. 8.6609 + 8108 =
9. 9.5207 + 3846 =
10. 10.4602 − 1161 =
11. 11.4461 + 5906 =
12. 12.6386 − 1971 =
13. 13.1409 − 1335 =
14. 14.4157 − 2043 =
15. 15.4839 + 3208 =
16. 16.5490 + 3877 =
17. 17.8058 − 1436 =
18. 18.8133 − 7858 =
19. 19.2315 + 1668 =
20. 20.5454 − 2481 =
21. 21.8506 + 4739 =
22. 22.7688 − 2775 =
23. 23.7593 + 1598 =
24. 24.7565 − 6787 =
25. 25.3771 + 2019 =
26. 26.4746 − 3064 =
27. 27.3162 + 6905 =
28. 28.3231 + 4622 =
29. 29.2429 − 1236 =
30. 30.8167 − 6257 =
31. 31.6128 − 6113 =
32. 32.2561 + 6724 =
33. 33.2343 + 5531 =
34. 34.3909 − 1707 =
35. 35.8829 + 4380 =
36. 36.5371 + 4324 =
37. 37.3599 + 1649 =
38. 38.4254 − 1601 =
39. 39.6482 + 1187 =
40. 40.2425 − 1922 =

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