4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 154 · 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. 1.4416 + 6015 =
2. 2.3033 − 1686 =
3. 3.8548 − 3146 =
4. 4.7425 + 3081 =
5. 5.6298 − 3008 =
6. 6.4560 − 2456 =
7. 7.6917 + 1296 =
8. 8.3607 + 1700 =
9. 9.7093 − 2448 =
10. 10.6291 − 4994 =
11. 11.3962 − 2128 =
12. 12.4151 + 5196 =
13. 13.3391 + 6626 =
14. 14.1408 + 7355 =
15. 15.8043 + 3987 =
16. 16.8666 − 6360 =
17. 17.5190 − 4969 =
18. 18.8574 − 4663 =
19. 19.8719 + 8167 =
20. 20.2546 + 4641 =
21. 21.5397 − 2871 =
22. 22.8261 − 6425 =
23. 23.8291 − 3476 =
24. 24.2368 + 1161 =
25. 25.1149 + 2611 =
26. 26.8017 + 7720 =
27. 27.4896 − 4052 =
28. 28.5761 − 4487 =
29. 29.3080 + 2213 =
30. 30.4680 − 4587 =
31. 31.2504 + 5725 =
32. 32.7650 − 7147 =
33. 33.3260 − 2434 =
34. 34.3378 + 4241 =
35. 35.5231 − 2268 =
36. 36.8019 − 5212 =
37. 37.2308 + 7050 =
38. 38.7323 + 6847 =
39. 39.6459 + 2178 =
40. 40.7195 − 5122 =

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