4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 122 · 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. 1.1978 + 8470 =
2. 2.8046 + 7658 =
3. 3.8267 − 4642 =
4. 4.7846 + 3854 =
5. 5.6724 + 6202 =
6. 6.1587 − 1290 =
7. 7.8729 − 6872 =
8. 8.8079 − 1352 =
9. 9.8547 + 1600 =
10. 10.8668 − 8498 =
11. 11.5217 − 3020 =
12. 12.7581 − 5150 =
13. 13.3535 − 1926 =
14. 14.8045 − 3175 =
15. 15.6855 + 3510 =
16. 16.1718 + 7888 =
17. 17.8777 − 5462 =
18. 18.7343 + 6026 =
19. 19.8783 + 1800 =
20. 20.7733 − 4610 =
21. 21.7832 − 1489 =
22. 22.7489 − 7297 =
23. 23.6282 + 7623 =
24. 24.8081 − 1868 =
25. 25.8070 + 8697 =
26. 26.2324 + 8325 =
27. 27.2357 + 2804 =
28. 28.8710 + 7588 =
29. 29.6678 − 5807 =
30. 30.3628 − 3408 =
31. 31.5359 − 3162 =
32. 32.7225 − 4668 =
33. 33.8826 − 6166 =
34. 34.7620 + 6509 =
35. 35.1708 + 7023 =
36. 36.6606 − 6443 =
37. 37.6627 + 8466 =
38. 38.8031 − 2875 =
39. 39.4969 + 3516 =
40. 40.3636 + 5559 =

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