4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 60 · 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. 1.1235 + 5252 =
2. 2.5166 + 4782 =
3. 3.2373 + 4308 =
4. 4.1907 + 5785 =
5. 5.2051 − 1272 =
6. 6.8531 − 6166 =
7. 7.3515 + 1371 =
8. 8.4509 + 8652 =
9. 9.6540 + 7927 =
10. 10.8241 + 1258 =
11. 11.5913 + 2705 =
12. 12.2929 + 3175 =
13. 13.8314 + 2623 =
14. 14.4462 − 2432 =
15. 15.4635 + 1739 =
16. 16.8009 + 7225 =
17. 17.8271 − 4080 =
18. 18.8885 − 5070 =
19. 19.6058 − 2184 =
20. 20.8117 − 1720 =
21. 21.1153 + 6106 =
22. 22.1305 + 1205 =
23. 23.3022 − 2196 =
24. 24.7884 − 4032 =
25. 25.1554 + 8125 =
26. 26.5801 + 6185 =
27. 27.3461 + 2748 =
28. 28.8639 + 2668 =
29. 29.6937 + 1717 =
30. 30.7791 + 8994 =
31. 31.2650 + 5531 =
32. 32.7326 − 6547 =
33. 33.6800 − 4357 =
34. 34.2785 − 2350 =
35. 35.3473 − 3365 =
36. 36.4262 + 4385 =
37. 37.5123 − 2356 =
38. 38.6161 + 2371 =
39. 39.8586 + 1442 =
40. 40.7558 − 4026 =

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