4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 17 · 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. 1.6518 + 6693 =
2. 2.4671 − 2611 =
3. 3.7310 − 2482 =
4. 4.1477 + 3040 =
5. 5.6209 + 5164 =
6. 6.6410 + 5187 =
7. 7.7518 + 2438 =
8. 8.6621 + 4386 =
9. 9.8914 − 7450 =
10. 10.1259 + 3029 =
11. 11.6421 − 6025 =
12. 12.7840 − 3178 =
13. 13.3712 − 1275 =
14. 14.2271 + 3365 =
15. 15.5863 − 2630 =
16. 16.3283 + 1801 =
17. 17.6827 − 3352 =
18. 18.2166 + 6511 =
19. 19.8925 − 7514 =
20. 20.2342 + 7582 =
21. 21.4841 + 1310 =
22. 22.7310 − 6312 =
23. 23.8711 + 3419 =
24. 24.6116 − 1892 =
25. 25.8894 − 1835 =
26. 26.3651 + 2239 =
27. 27.3951 + 2867 =
28. 28.4077 + 1860 =
29. 29.8971 − 3197 =
30. 30.3784 + 1390 =
31. 31.8888 + 5583 =
32. 32.3566 + 2399 =
33. 33.5666 + 3829 =
34. 34.2174 + 1374 =
35. 35.1469 + 8455 =
36. 36.7014 + 3126 =
37. 37.8332 + 7038 =
38. 38.4754 + 1553 =
39. 39.5083 + 7189 =
40. 40.7799 − 6370 =

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