4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 217 · 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. 1.4027 + 3920 =
2. 2.7047 + 6834 =
3. 3.5572 + 6321 =
4. 4.8560 + 6962 =
5. 5.7491 + 8957 =
6. 6.1187 + 8238 =
7. 7.7619 + 4730 =
8. 8.4192 + 6766 =
9. 9.2015 + 4304 =
10. 10.2058 + 2420 =
11. 11.3028 − 2333 =
12. 12.3554 + 4395 =
13. 13.3146 + 8761 =
14. 14.7462 + 1401 =
15. 15.4657 − 1589 =
16. 16.5278 − 2439 =
17. 17.8408 − 6528 =
18. 18.8890 + 1278 =
19. 19.6242 − 1426 =
20. 20.8683 + 8224 =
21. 21.6572 + 4496 =
22. 22.5855 + 4541 =
23. 23.8931 − 8149 =
24. 24.5854 + 6160 =
25. 25.1320 + 7783 =
26. 26.1284 + 8859 =
27. 27.3905 + 1440 =
28. 28.5502 + 3254 =
29. 29.8183 − 3158 =
30. 30.7648 + 7478 =
31. 31.5460 − 4539 =
32. 32.8293 − 3901 =
33. 33.6730 − 1612 =
34. 34.2560 + 2435 =
35. 35.2867 − 2645 =
36. 36.6738 − 2663 =
37. 37.3379 − 2316 =
38. 38.5446 + 8798 =
39. 39.1984 + 5622 =
40. 40.8425 − 7355 =

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