4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 95 · 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. 1.3265 − 2246 =
2. 2.5887 − 5361 =
3. 3.5143 + 7329 =
4. 4.1950 − 1238 =
5. 5.6557 + 5812 =
6. 6.8827 − 5562 =
7. 7.2629 − 2187 =
8. 8.6278 − 4742 =
9. 9.5056 − 2066 =
10. 10.8727 − 7328 =
11. 11.7549 + 4075 =
12. 12.8057 − 3877 =
13. 13.3586 − 3119 =
14. 14.3690 − 1151 =
15. 15.4385 − 2252 =
16. 16.8082 − 6809 =
17. 17.6199 − 1618 =
18. 18.4249 − 1447 =
19. 19.2857 − 1740 =
20. 20.7533 + 4228 =
21. 21.4586 − 3095 =
22. 22.7132 − 3209 =
23. 23.6512 − 5863 =
24. 24.1324 + 4106 =
25. 25.6696 + 8042 =
26. 26.8389 − 2743 =
27. 27.2396 − 1982 =
28. 28.8636 − 7343 =
29. 29.4078 − 2301 =
30. 30.2807 + 5515 =
31. 31.8345 − 6755 =
32. 32.5325 + 2245 =
33. 33.4406 − 4370 =
34. 34.3789 + 7481 =
35. 35.4953 − 4228 =
36. 36.7816 − 3050 =
37. 37.7854 + 2095 =
38. 38.3050 + 5979 =
39. 39.5109 − 3438 =
40. 40.7378 + 6169 =

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