4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 214 · 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. 1.1880 + 4271 =
2. 2.6742 + 4457 =
3. 3.8118 + 8535 =
4. 4.6048 − 3518 =
5. 5.4267 + 4456 =
6. 6.8992 + 8469 =
7. 7.6976 + 2203 =
8. 8.8927 − 5539 =
9. 9.5592 + 7193 =
10. 10.1300 + 1239 =
11. 11.7001 − 1805 =
12. 12.5859 + 5493 =
13. 13.6963 + 6640 =
14. 14.4578 + 8859 =
15. 15.8869 − 4607 =
16. 16.5127 + 6076 =
17. 17.2986 − 2837 =
18. 18.5176 − 1986 =
19. 19.8542 + 2872 =
20. 20.1778 − 1608 =
21. 21.4060 + 7158 =
22. 22.4624 − 2195 =
23. 23.3212 + 4516 =
24. 24.4686 − 1831 =
25. 25.6469 + 2164 =
26. 26.7997 + 5172 =
27. 27.3611 − 3370 =
28. 28.5210 + 1243 =
29. 29.7555 − 5326 =
30. 30.5954 − 5551 =
31. 31.8334 + 3608 =
32. 32.6401 − 5542 =
33. 33.5214 + 1674 =
34. 34.5277 + 4003 =
35. 35.5040 − 2181 =
36. 36.2656 + 7809 =
37. 37.5094 + 5592 =
38. 38.4701 − 2677 =
39. 39.2825 − 2015 =
40. 40.2975 − 1651 =

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