4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 148 · 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. 1.6878 − 5045 =
2. 2.5085 + 6031 =
3. 3.3252 − 1626 =
4. 4.7582 + 4830 =
5. 5.5531 + 8550 =
6. 6.1253 + 2436 =
7. 7.7146 + 3065 =
8. 8.2342 + 6728 =
9. 9.1439 + 8022 =
10. 10.1571 + 1741 =
11. 11.4013 + 4353 =
12. 12.2125 + 5808 =
13. 13.6605 − 3053 =
14. 14.2356 + 4807 =
15. 15.6433 + 2346 =
16. 16.5903 − 5746 =
17. 17.3416 − 1923 =
18. 18.8972 − 4232 =
19. 19.3339 + 8174 =
20. 20.6962 − 1545 =
21. 21.3780 + 4079 =
22. 22.5826 + 8877 =
23. 23.4758 − 1812 =
24. 24.1459 + 3851 =
25. 25.7678 − 7456 =
26. 26.8354 − 6563 =
27. 27.2446 + 6883 =
28. 28.7571 + 6805 =
29. 29.4872 − 2017 =
30. 30.3650 + 3510 =
31. 31.5985 − 2400 =
32. 32.3493 + 8859 =
33. 33.7604 + 5638 =
34. 34.4391 + 4202 =
35. 35.3259 + 8176 =
36. 36.6314 + 6628 =
37. 37.8724 − 1997 =
38. 38.1988 − 1705 =
39. 39.3648 − 1831 =
40. 40.3344 + 3609 =

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