4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 74 · 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. 1.1957 + 8067 =
2. 2.8561 − 1914 =
3. 3.8757 − 6833 =
4. 4.2819 − 1179 =
5. 5.4859 − 2311 =
6. 6.2494 + 1747 =
7. 7.3568 − 3059 =
8. 8.8712 − 5952 =
9. 9.6843 − 6277 =
10. 10.4319 + 4462 =
11. 11.6995 − 1670 =
12. 12.8376 − 5504 =
13. 13.2382 + 1741 =
14. 14.3285 − 3234 =
15. 15.7013 − 1164 =
16. 16.5075 + 8456 =
17. 17.7437 − 2472 =
18. 18.8068 − 4311 =
19. 19.5957 − 3322 =
20. 20.2408 + 6582 =
21. 21.2735 + 1177 =
22. 22.3628 + 1323 =
23. 23.4644 − 3956 =
24. 24.7544 + 3667 =
25. 25.5028 − 4166 =
26. 26.5292 − 2663 =
27. 27.8677 − 6380 =
28. 28.4731 + 1826 =
29. 29.1400 + 2301 =
30. 30.7314 + 5239 =
31. 31.1352 + 8200 =
32. 32.6571 + 4104 =
33. 33.2960 + 5775 =
34. 34.4384 − 2236 =
35. 35.4102 + 7798 =
36. 36.8397 − 6763 =
37. 37.5577 + 2559 =
38. 38.8573 + 2130 =
39. 39.2249 + 2615 =
40. 40.6445 − 2174 =

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