4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 174 · 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. 1.4852 + 1595 =
2. 2.5810 − 3538 =
3. 3.5817 − 3711 =
4. 4.8931 + 1421 =
5. 5.4011 − 2110 =
6. 6.8870 − 5752 =
7. 7.2393 + 5820 =
8. 8.7251 + 1115 =
9. 9.7191 − 4956 =
10. 10.4877 + 2319 =
11. 11.8845 + 4741 =
12. 12.7454 − 2734 =
13. 13.4665 + 8043 =
14. 14.6379 + 5015 =
15. 15.3041 + 5635 =
16. 16.4331 + 5081 =
17. 17.1119 + 5602 =
18. 18.3552 − 2800 =
19. 19.1983 + 4683 =
20. 20.2914 + 4271 =
21. 21.4111 − 2928 =
22. 22.4644 + 4218 =
23. 23.6254 − 5766 =
24. 24.7882 + 5918 =
25. 25.3236 + 3764 =
26. 26.3271 − 3121 =
27. 27.3609 + 5082 =
28. 28.7870 + 3262 =
29. 29.4407 + 2039 =
30. 30.8468 − 5360 =
31. 31.5332 − 3502 =
32. 32.3802 + 1993 =
33. 33.7060 + 3112 =
34. 34.1177 + 4418 =
35. 35.6994 − 3955 =
36. 36.7776 + 8904 =
37. 37.8700 + 8034 =
38. 38.7796 + 5344 =
39. 39.6387 + 5903 =
40. 40.3006 + 4638 =

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