4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 69 · 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. 1.6988 − 4440 =
2. 2.8728 − 6811 =
3. 3.2751 + 3116 =
4. 4.2086 + 7226 =
5. 5.4457 + 3849 =
6. 6.4169 + 7846 =
7. 7.2685 + 6449 =
8. 8.5793 − 1181 =
9. 9.7372 + 7785 =
10. 10.2903 + 8177 =
11. 11.7668 + 7870 =
12. 12.8378 − 6922 =
13. 13.6766 + 4076 =
14. 14.5525 − 2461 =
15. 15.8941 + 2359 =
16. 16.5755 − 3086 =
17. 17.5200 + 7190 =
18. 18.7409 + 7398 =
19. 19.5853 − 4561 =
20. 20.8842 + 6816 =
21. 21.6468 + 2224 =
22. 22.2176 + 1298 =
23. 23.8906 − 4238 =
24. 24.8673 − 4363 =
25. 25.5938 − 5457 =
26. 26.8087 − 4540 =
27. 27.4399 + 5661 =
28. 28.8532 + 1560 =
29. 29.7590 − 6613 =
30. 30.7929 − 4104 =
31. 31.8425 − 2365 =
32. 32.6091 + 1999 =
33. 33.6010 + 3672 =
34. 34.7811 − 2165 =
35. 35.5673 − 5551 =
36. 36.7586 − 5548 =
37. 37.5125 − 3437 =
38. 38.4552 + 8626 =
39. 39.6640 − 2322 =
40. 40.8460 − 1235 =

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