4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 159 · 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. 1.2615 + 4808 =
2. 2.2356 + 4190 =
3. 3.5577 − 2264 =
4. 4.8534 + 1103 =
5. 5.8357 − 2414 =
6. 6.2552 + 6810 =
7. 7.8612 + 4330 =
8. 8.8487 − 7925 =
9. 9.3442 + 7112 =
10. 10.8897 + 2643 =
11. 11.3843 − 1837 =
12. 12.2159 + 3644 =
13. 13.8429 − 4350 =
14. 14.4457 + 5415 =
15. 15.1810 + 7734 =
16. 16.3369 − 3327 =
17. 17.4386 + 8242 =
18. 18.7809 − 7256 =
19. 19.3040 − 1817 =
20. 20.8167 + 1654 =
21. 21.2338 + 5287 =
22. 22.4359 − 1876 =
23. 23.7990 − 7419 =
24. 24.5452 − 2999 =
25. 25.3050 − 2354 =
26. 26.6854 + 1587 =
27. 27.5584 − 4943 =
28. 28.3647 + 1565 =
29. 29.6991 + 3502 =
30. 30.6621 + 4816 =
31. 31.4007 + 5012 =
32. 32.6416 − 1586 =
33. 33.5119 + 7603 =
34. 34.4918 − 3050 =
35. 35.7412 − 5556 =
36. 36.5566 + 7072 =
37. 37.5158 + 2238 =
38. 38.6919 − 4885 =
39. 39.3858 + 6280 =
40. 40.3476 + 5385 =

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