4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 36 · 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. 1.4339 + 3973 =
2. 2.7587 + 4785 =
3. 3.7998 + 5677 =
4. 4.8467 − 6971 =
5. 5.3741 − 2369 =
6. 6.4049 − 3300 =
7. 7.6955 + 6449 =
8. 8.7326 + 6582 =
9. 9.7299 + 6262 =
10. 10.2552 − 1397 =
11. 11.6203 + 4832 =
12. 12.3512 − 2101 =
13. 13.1408 − 1376 =
14. 14.1125 + 4927 =
15. 15.3908 + 1832 =
16. 16.6943 − 3491 =
17. 17.1245 + 5413 =
18. 18.4344 − 4074 =
19. 19.7825 − 2397 =
20. 20.5379 + 2900 =
21. 21.6512 + 2238 =
22. 22.5476 + 2216 =
23. 23.3534 + 3456 =
24. 24.5807 − 5154 =
25. 25.6252 − 3214 =
26. 26.4216 + 7969 =
27. 27.7421 + 6619 =
28. 28.6731 + 1132 =
29. 29.5621 + 2317 =
30. 30.7444 + 4444 =
31. 31.5943 − 2641 =
32. 32.3825 + 1249 =
33. 33.5686 − 1509 =
34. 34.5629 + 7519 =
35. 35.3365 − 1557 =
36. 36.2764 + 3386 =
37. 37.6899 − 1143 =
38. 38.5349 + 1452 =
39. 39.7006 + 7804 =
40. 40.2989 + 5273 =

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