4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 218 · 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. 1.7579 − 4573 =
2. 2.8996 + 3198 =
3. 3.1442 + 7049 =
4. 4.5753 + 4555 =
5. 5.7663 − 6862 =
6. 6.1477 + 8702 =
7. 7.3578 − 1326 =
8. 8.8204 + 1132 =
9. 9.2273 + 6977 =
10. 10.7175 − 2415 =
11. 11.7601 + 7026 =
12. 12.3391 − 2413 =
13. 13.4023 + 3741 =
14. 14.8174 + 1491 =
15. 15.4883 + 6885 =
16. 16.3785 − 1835 =
17. 17.5249 + 1462 =
18. 18.7762 + 6419 =
19. 19.6494 + 7054 =
20. 20.3102 + 2391 =
21. 21.3971 + 5500 =
22. 22.4750 − 2484 =
23. 23.1347 + 4872 =
24. 24.8200 − 6198 =
25. 25.7505 − 2156 =
26. 26.2265 + 4401 =
27. 27.7699 − 5832 =
28. 28.3438 + 3689 =
29. 29.5523 + 8989 =
30. 30.8930 − 7197 =
31. 31.7693 − 2375 =
32. 32.6626 − 3110 =
33. 33.3310 + 3622 =
34. 34.1551 + 2907 =
35. 35.7408 − 6650 =
36. 36.3631 − 2884 =
37. 37.4183 + 5710 =
38. 38.3647 − 2222 =
39. 39.8890 − 7949 =
40. 40.5178 + 7388 =

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