4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 177 · 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. 1.7125 + 8410 =
2. 2.1763 + 7851 =
3. 3.6845 − 1601 =
4. 4.1841 + 5052 =
5. 5.8376 + 5316 =
6. 6.4685 + 7222 =
7. 7.7414 − 1531 =
8. 8.7989 − 3320 =
9. 9.6402 + 6124 =
10. 10.2724 − 2498 =
11. 11.2035 + 2269 =
12. 12.8069 − 6213 =
13. 13.6809 − 6247 =
14. 14.5360 + 8634 =
15. 15.6519 − 5025 =
16. 16.5456 − 2555 =
17. 17.7968 − 7117 =
18. 18.1823 + 6935 =
19. 19.5180 − 3549 =
20. 20.5834 + 6448 =
21. 21.5898 + 6830 =
22. 22.5460 + 4862 =
23. 23.4196 + 2521 =
24. 24.7254 + 2065 =
25. 25.8803 − 6722 =
26. 26.7643 − 4484 =
27. 27.2308 + 1832 =
28. 28.5859 − 4970 =
29. 29.7052 + 5663 =
30. 30.6745 − 4285 =
31. 31.8115 + 4545 =
32. 32.6600 − 5886 =
33. 33.3713 + 4191 =
34. 34.4721 − 4537 =
35. 35.5981 − 3109 =
36. 36.1807 + 2566 =
37. 37.7158 + 7205 =
38. 38.7515 + 4755 =
39. 39.2125 + 6593 =
40. 40.7064 − 1726 =

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