4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 103 · 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. 1.5043 + 3596 =
2. 2.8905 + 6182 =
3. 3.1534 + 1619 =
4. 4.6186 − 3417 =
5. 5.2216 + 4598 =
6. 6.6530 − 1806 =
7. 7.3880 + 7143 =
8. 8.6702 − 2187 =
9. 9.5438 − 3057 =
10. 10.4861 − 1788 =
11. 11.4115 + 5213 =
12. 12.3810 + 7909 =
13. 13.6624 + 2624 =
14. 14.3359 + 4207 =
15. 15.7383 − 5493 =
16. 16.7077 − 6542 =
17. 17.7414 − 1120 =
18. 18.8535 − 8308 =
19. 19.6447 + 1663 =
20. 20.8295 + 4436 =
21. 21.7659 + 6593 =
22. 22.8992 − 4646 =
23. 23.3471 − 1999 =
24. 24.3450 + 1830 =
25. 25.6889 + 5693 =
26. 26.2923 − 1646 =
27. 27.2340 + 5870 =
28. 28.1436 + 3088 =
29. 29.3520 + 3850 =
30. 30.5099 − 3460 =
31. 31.7204 + 3608 =
32. 32.6412 − 5244 =
33. 33.5884 + 7182 =
34. 34.4200 − 2143 =
35. 35.1237 + 3489 =
36. 36.2880 + 3134 =
37. 37.3320 + 3999 =
38. 38.3408 + 7763 =
39. 39.8851 − 8580 =
40. 40.5715 + 1945 =

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