4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 182 · 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. 1.8522 − 8248 =
2. 2.1782 − 1496 =
3. 3.6953 − 3340 =
4. 4.5491 + 3763 =
5. 5.2252 + 6398 =
6. 6.4266 − 1413 =
7. 7.1364 + 5313 =
8. 8.7347 + 8288 =
9. 9.1814 − 1682 =
10. 10.4313 + 5867 =
11. 11.1359 + 5552 =
12. 12.4783 − 2810 =
13. 13.6593 + 1651 =
14. 14.3886 − 3774 =
15. 15.8967 − 5541 =
16. 16.7343 − 5290 =
17. 17.2486 − 2233 =
18. 18.3863 − 1403 =
19. 19.7420 + 7665 =
20. 20.6791 − 3247 =
21. 21.1999 + 5147 =
22. 22.2616 + 2094 =
23. 23.3024 + 8535 =
24. 24.4163 + 4191 =
25. 25.2865 − 2370 =
26. 26.5719 − 3314 =
27. 27.6252 + 1848 =
28. 28.5812 + 7359 =
29. 29.8436 − 6085 =
30. 30.6060 + 3102 =
31. 31.1781 + 5433 =
32. 32.1861 + 4470 =
33. 33.2473 − 1420 =
34. 34.8298 − 3730 =
35. 35.5652 − 1601 =
36. 36.2739 + 2261 =
37. 37.8254 − 5771 =
38. 38.4336 + 8715 =
39. 39.2268 + 3187 =
40. 40.7511 − 5776 =

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