4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 30 · 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. 1.7579 − 2367 =
2. 2.8679 − 2255 =
3. 3.4315 + 7851 =
4. 4.3091 − 1739 =
5. 5.6741 + 1991 =
6. 6.7334 − 7213 =
7. 7.1798 − 1411 =
8. 8.3931 + 8083 =
9. 9.5800 − 1718 =
10. 10.8949 + 1457 =
11. 11.5438 − 2029 =
12. 12.5814 + 3487 =
13. 13.5307 − 5193 =
14. 14.6279 − 3333 =
15. 15.7656 − 4296 =
16. 16.1883 + 2622 =
17. 17.6536 + 2872 =
18. 18.3178 + 7069 =
19. 19.6051 + 2905 =
20. 20.5664 + 3180 =
21. 21.8806 − 4794 =
22. 22.2160 − 1632 =
23. 23.3208 + 6619 =
24. 24.5740 + 7103 =
25. 25.8126 − 2847 =
26. 26.8324 − 2599 =
27. 27.7923 − 4668 =
28. 28.5071 − 3042 =
29. 29.5533 − 1787 =
30. 30.5277 − 4551 =
31. 31.8372 − 2040 =
32. 32.5978 − 5742 =
33. 33.3022 + 2112 =
34. 34.2329 − 1562 =
35. 35.3258 + 1793 =
36. 36.3170 + 3881 =
37. 37.1278 + 6239 =
38. 38.4108 + 1900 =
39. 39.5868 + 7734 =
40. 40.4095 − 1155 =

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths