4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 9 · 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. 1.3764 + 6936 =
2. 2.7946 − 1162 =
3. 3.6885 − 2895 =
4. 4.3504 + 7400 =
5. 5.4497 + 7876 =
6. 6.5319 + 4648 =
7. 7.3686 − 1956 =
8. 8.7148 − 1899 =
9. 9.5225 − 2225 =
10. 10.1746 + 3164 =
11. 11.8828 − 1586 =
12. 12.1331 + 8500 =
13. 13.2227 − 1982 =
14. 14.4548 + 2984 =
15. 15.4131 − 3468 =
16. 16.5412 + 6093 =
17. 17.1724 + 7574 =
18. 18.8895 − 6664 =
19. 19.6122 + 3607 =
20. 20.6057 − 5809 =
21. 21.1170 + 6899 =
22. 22.3119 + 5651 =
23. 23.7935 − 2539 =
24. 24.2834 + 5114 =
25. 25.7233 − 3493 =
26. 26.8972 − 8632 =
27. 27.8772 + 1803 =
28. 28.1973 + 3935 =
29. 29.8506 − 1507 =
30. 30.7039 − 5042 =
31. 31.6916 + 8154 =
32. 32.7279 − 3392 =
33. 33.8689 − 6358 =
34. 34.6074 − 1308 =
35. 35.7350 − 7307 =
36. 36.6473 − 4961 =
37. 37.8972 + 2997 =
38. 38.4718 + 3634 =
39. 39.1845 − 1612 =
40. 40.4195 − 1280 =

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