4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 94 · 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. 1.7761 − 3591 =
2. 2.4731 − 4340 =
3. 3.5893 − 2053 =
4. 4.6913 − 2079 =
5. 5.6188 + 7050 =
6. 6.7567 + 1650 =
7. 7.7173 + 1169 =
8. 8.7786 + 2920 =
9. 9.6605 − 1825 =
10. 10.3723 − 3358 =
11. 11.7875 − 2362 =
12. 12.8604 − 1496 =
13. 13.2707 + 2012 =
14. 14.7574 − 1224 =
15. 15.4153 − 2261 =
16. 16.8213 − 7797 =
17. 17.3717 − 1883 =
18. 18.2836 + 2003 =
19. 19.7376 − 1238 =
20. 20.6786 − 3186 =
21. 21.8048 + 8488 =
22. 22.2978 + 8426 =
23. 23.4002 + 2211 =
24. 24.6790 + 5342 =
25. 25.3173 + 6493 =
26. 26.7997 − 5577 =
27. 27.5658 − 5171 =
28. 28.5111 − 4809 =
29. 29.6751 − 5248 =
30. 30.5211 − 4377 =
31. 31.1793 + 7020 =
32. 32.8181 + 1868 =
33. 33.7819 + 4743 =
34. 34.7228 + 5487 =
35. 35.7763 − 4050 =
36. 36.5199 − 3222 =
37. 37.3947 + 2809 =
38. 38.5235 + 2866 =
39. 39.8542 + 2605 =
40. 40.5836 − 2301 =

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