4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 153 · 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. 1.3502 + 8469 =
2. 2.7154 − 6923 =
3. 3.6841 + 4877 =
4. 4.4781 + 7362 =
5. 5.7750 − 5914 =
6. 6.8808 − 4835 =
7. 7.4200 + 7051 =
8. 8.1509 + 3900 =
9. 9.8486 − 6766 =
10. 10.2880 − 2444 =
11. 11.5272 + 2106 =
12. 12.4738 − 2274 =
13. 13.6630 − 3749 =
14. 14.6853 + 8662 =
15. 15.2735 + 2310 =
16. 16.3226 + 6410 =
17. 17.2978 − 1809 =
18. 18.5279 − 1191 =
19. 19.7441 − 5800 =
20. 20.8842 − 1143 =
21. 21.4168 − 1652 =
22. 22.1911 + 2477 =
23. 23.6576 − 6250 =
24. 24.8556 − 2563 =
25. 25.6189 − 2334 =
26. 26.5409 + 1254 =
27. 27.5337 + 3424 =
28. 28.7207 + 2361 =
29. 29.6512 − 1119 =
30. 30.5585 + 8995 =
31. 31.5015 − 3535 =
32. 32.3083 + 3219 =
33. 33.7858 − 1421 =
34. 34.2078 + 8776 =
35. 35.2769 − 2006 =
36. 36.8599 − 1896 =
37. 37.4007 − 2174 =
38. 38.1280 + 7363 =
39. 39.1681 − 1162 =
40. 40.6161 − 1945 =

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