4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 207 · 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. 1.5376 + 7740 =
2. 2.3615 + 2325 =
3. 3.3285 + 8545 =
4. 4.5654 + 4199 =
5. 5.6895 − 6832 =
6. 6.8206 + 3110 =
7. 7.2756 − 1172 =
8. 8.5402 + 7844 =
9. 9.5586 − 5585 =
10. 10.3441 − 2989 =
11. 11.4627 − 1587 =
12. 12.5872 + 8734 =
13. 13.5780 + 3780 =
14. 14.4707 − 2760 =
15. 15.2666 + 3527 =
16. 16.5563 + 4237 =
17. 17.3889 + 7148 =
18. 18.6201 − 1611 =
19. 19.7510 − 3702 =
20. 20.2532 + 1812 =
21. 21.7613 − 7101 =
22. 22.4293 + 5191 =
23. 23.7430 − 2496 =
24. 24.1889 + 7800 =
25. 25.1571 + 2276 =
26. 26.8503 + 5693 =
27. 27.7868 − 6173 =
28. 28.6869 + 4765 =
29. 29.7916 + 2866 =
30. 30.1885 − 1766 =
31. 31.5105 + 4849 =
32. 32.3030 − 3015 =
33. 33.6849 + 3188 =
34. 34.2527 − 1746 =
35. 35.4839 − 4250 =
36. 36.8122 − 5326 =
37. 37.8396 + 4759 =
38. 38.7606 + 5132 =
39. 39.2371 + 7693 =
40. 40.5122 − 3998 =

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