4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 7 · 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. 1.8977 − 4921 =
2. 2.1577 + 1857 =
3. 3.6672 − 1192 =
4. 4.3186 + 7768 =
5. 5.7795 − 6016 =
6. 6.3512 + 8819 =
7. 7.6297 − 1822 =
8. 8.3887 − 3436 =
9. 9.6494 − 2129 =
10. 10.2618 + 1670 =
11. 11.4755 − 1809 =
12. 12.1709 + 3288 =
13. 13.2519 + 1110 =
14. 14.6983 − 6345 =
15. 15.4666 + 3113 =
16. 16.3238 + 5693 =
17. 17.7749 − 4761 =
18. 18.5525 + 1906 =
19. 19.7493 − 5552 =
20. 20.8427 − 3590 =
21. 21.3154 + 7967 =
22. 22.8434 − 4207 =
23. 23.4694 − 2008 =
24. 24.5852 − 4048 =
25. 25.4693 + 1881 =
26. 26.5237 + 4470 =
27. 27.8625 − 1190 =
28. 28.4461 + 4761 =
29. 29.8755 − 4204 =
30. 30.3857 + 7879 =
31. 31.8091 + 3056 =
32. 32.2663 + 7947 =
33. 33.6888 − 1591 =
34. 34.7333 + 7529 =
35. 35.2047 − 1262 =
36. 36.1574 + 7517 =
37. 37.5356 + 1654 =
38. 38.6881 − 2064 =
39. 39.8878 − 4084 =
40. 40.8009 + 3057 =

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