4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 201 · 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. 1.5805 − 2866 =
2. 2.3117 + 7308 =
3. 3.3214 + 2261 =
4. 4.3292 + 2062 =
5. 5.1587 + 4415 =
6. 6.5716 + 7445 =
7. 7.7408 − 1772 =
8. 8.8411 − 1433 =
9. 9.5257 + 5256 =
10. 10.3123 + 5617 =
11. 11.3283 + 6754 =
12. 12.2040 + 2371 =
13. 13.2383 − 1903 =
14. 14.7122 + 2428 =
15. 15.6566 − 1786 =
16. 16.8860 − 1808 =
17. 17.4043 − 2454 =
18. 18.8751 − 4052 =
19. 19.3886 + 8131 =
20. 20.5248 + 7634 =
21. 21.8975 − 2779 =
22. 22.6905 + 5910 =
23. 23.2782 + 2740 =
24. 24.6403 − 2149 =
25. 25.1868 + 2849 =
26. 26.4743 + 2110 =
27. 27.1917 + 4198 =
28. 28.2300 + 8270 =
29. 29.2155 + 5694 =
30. 30.3670 + 1118 =
31. 31.5265 + 6751 =
32. 32.4696 + 5627 =
33. 33.8461 + 8802 =
34. 34.7381 − 3058 =
35. 35.6744 − 1293 =
36. 36.1367 + 7717 =
37. 37.1106 + 2377 =
38. 38.8144 + 5363 =
39. 39.6301 − 1730 =
40. 40.8921 + 4482 =

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