4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 10 · 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. 1.3678 + 7438 =
2. 2.3476 + 1295 =
3. 3.6866 − 5668 =
4. 4.1685 − 1326 =
5. 5.1755 + 3216 =
6. 6.7321 + 2304 =
7. 7.3246 + 8094 =
8. 8.3333 − 3030 =
9. 9.6096 − 2406 =
10. 10.2451 + 5484 =
11. 11.2082 + 2475 =
12. 12.3817 + 1424 =
13. 13.5623 − 1942 =
14. 14.6212 + 4996 =
15. 15.7644 − 1411 =
16. 16.4561 + 6154 =
17. 17.8502 + 8101 =
18. 18.4019 − 3943 =
19. 19.5178 + 1132 =
20. 20.1830 + 7047 =
21. 21.8558 + 4315 =
22. 22.3213 + 5467 =
23. 23.7951 − 1192 =
24. 24.6101 + 2206 =
25. 25.8474 + 2358 =
26. 26.6177 − 1376 =
27. 27.2866 + 5887 =
28. 28.5367 − 1394 =
29. 29.5999 − 2467 =
30. 30.7551 − 5520 =
31. 31.7142 + 7393 =
32. 32.5006 + 7332 =
33. 33.5205 − 4125 =
34. 34.1996 + 4490 =
35. 35.6805 + 6808 =
36. 36.8234 − 7027 =
37. 37.8014 + 1605 =
38. 38.8110 − 7408 =
39. 39.6775 − 3902 =
40. 40.6086 − 5118 =

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