4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 3 · 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. 1.8791 + 6800 =
2. 2.8817 + 5132 =
3. 3.1506 + 5486 =
4. 4.7425 − 1222 =
5. 5.8283 + 5286 =
6. 6.3796 + 4222 =
7. 7.3179 + 2215 =
8. 8.3968 + 4972 =
9. 9.4623 + 1855 =
10. 10.2189 + 5650 =
11. 11.5980 − 5765 =
12. 12.4751 + 2700 =
13. 13.8906 − 4191 =
14. 14.7241 + 2655 =
15. 15.4432 − 1347 =
16. 16.2835 − 2520 =
17. 17.7156 − 3714 =
18. 18.3110 − 1320 =
19. 19.1895 + 8763 =
20. 20.4683 + 2835 =
21. 21.5263 + 1637 =
22. 22.7919 + 6075 =
23. 23.3689 + 7049 =
24. 24.2382 + 3497 =
25. 25.6149 − 2461 =
26. 26.8113 − 1537 =
27. 27.6876 − 1110 =
28. 28.2356 + 8692 =
29. 29.1564 + 1845 =
30. 30.6376 − 3933 =
31. 31.8899 + 1375 =
32. 32.8633 − 7379 =
33. 33.8186 − 1432 =
34. 34.3778 + 5862 =
35. 35.5492 + 8221 =
36. 36.3724 − 2373 =
37. 37.6519 − 3760 =
38. 38.4405 − 3241 =
39. 39.6037 + 4090 =
40. 40.3280 − 2018 =

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