4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 51 · 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. 1.1975 + 3865 =
2. 2.4985 + 8181 =
3. 3.6728 + 4188 =
4. 4.7059 − 2350 =
5. 5.8884 − 4159 =
6. 6.4995 − 1758 =
7. 7.4767 − 2272 =
8. 8.3225 + 7095 =
9. 9.4194 − 2658 =
10. 10.5212 + 7383 =
11. 11.7467 − 2465 =
12. 12.4385 + 1895 =
13. 13.7477 + 2665 =
14. 14.1945 − 1306 =
15. 15.6760 + 1778 =
16. 16.2569 − 1136 =
17. 17.2935 − 2709 =
18. 18.7237 + 4370 =
19. 19.6123 + 5132 =
20. 20.4695 − 2262 =
21. 21.4850 + 2375 =
22. 22.8731 + 6964 =
23. 23.4729 + 7455 =
24. 24.7247 − 6513 =
25. 25.4606 − 2264 =
26. 26.5412 − 3526 =
27. 27.1394 + 6460 =
28. 28.7806 − 5380 =
29. 29.8778 + 1801 =
30. 30.7255 + 8123 =
31. 31.4878 − 3203 =
32. 32.7617 − 1506 =
33. 33.6905 + 7197 =
34. 34.4607 − 4097 =
35. 35.8566 − 5814 =
36. 36.4264 − 3289 =
37. 37.8138 − 7024 =
38. 38.4298 + 6389 =
39. 39.5670 + 4130 =
40. 40.8619 − 5582 =

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