4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 138 · 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. 1.8126 − 1563 =
2. 2.6562 + 4356 =
3. 3.8332 − 2938 =
4. 4.6972 − 1142 =
5. 5.7184 − 1553 =
6. 6.5378 + 5423 =
7. 7.7065 − 3048 =
8. 8.7770 + 3453 =
9. 9.4246 + 6343 =
10. 10.8033 − 3883 =
11. 11.2913 + 6208 =
12. 12.5271 − 1169 =
13. 13.7878 − 4047 =
14. 14.6071 + 2572 =
15. 15.1372 + 1915 =
16. 16.4386 − 3292 =
17. 17.7650 + 4390 =
18. 18.5611 − 1569 =
19. 19.5922 − 5257 =
20. 20.7772 + 3603 =
21. 21.1988 + 6127 =
22. 22.4194 − 2645 =
23. 23.6035 + 2684 =
24. 24.8197 + 6383 =
25. 25.1139 + 6068 =
26. 26.5515 + 6482 =
27. 27.5755 + 5536 =
28. 28.6892 + 2033 =
29. 29.5743 − 3768 =
30. 30.2341 − 2144 =
31. 31.5431 − 3016 =
32. 32.6493 − 3777 =
33. 33.7030 − 6636 =
34. 34.6344 + 1766 =
35. 35.1422 + 7967 =
36. 36.3146 + 1820 =
37. 37.8280 − 7411 =
38. 38.3543 − 2840 =
39. 39.8896 − 2688 =
40. 40.7070 − 1117 =

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