4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 48 · 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. 1.2721 + 4277 =
2. 2.8946 − 2724 =
3. 3.4257 + 2488 =
4. 4.5380 + 2459 =
5. 5.2554 + 8518 =
6. 6.2224 + 4897 =
7. 7.4825 + 3543 =
8. 8.3444 − 1251 =
9. 9.7271 + 2253 =
10. 10.4544 + 1879 =
11. 11.4119 − 2458 =
12. 12.3207 − 1529 =
13. 13.2427 + 5896 =
14. 14.1983 + 4052 =
15. 15.3775 + 6298 =
16. 16.7029 − 2578 =
17. 17.8008 − 2961 =
18. 18.7767 − 5434 =
19. 19.3988 + 8880 =
20. 20.6056 − 5906 =
21. 21.8443 − 2048 =
22. 22.3281 + 4922 =
23. 23.2077 − 1958 =
24. 24.8183 − 6961 =
25. 25.3070 + 8093 =
26. 26.8727 − 5348 =
27. 27.1467 + 6567 =
28. 28.6008 + 1493 =
29. 29.3200 − 2751 =
30. 30.7381 + 8354 =
31. 31.8663 − 6811 =
32. 32.3011 − 2415 =
33. 33.5805 + 3371 =
34. 34.5858 − 2139 =
35. 35.4746 − 4200 =
36. 36.2282 − 2167 =
37. 37.2902 + 3190 =
38. 38.1559 + 6785 =
39. 39.4247 + 6614 =
40. 40.5134 − 3984 =

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