4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 89 · 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. 1.4423 + 1949 =
2. 2.5181 − 4032 =
3. 3.6573 + 4969 =
4. 4.8179 − 1869 =
5. 5.1188 + 4898 =
6. 6.6792 + 1336 =
7. 7.6282 − 3438 =
8. 8.2654 + 6475 =
9. 9.6442 + 7650 =
10. 10.5100 + 5851 =
11. 11.4441 − 2841 =
12. 12.1913 + 4223 =
13. 13.7055 − 3963 =
14. 14.4052 − 3507 =
15. 15.6353 − 2069 =
16. 16.7264 + 6942 =
17. 17.6463 − 3849 =
18. 18.2888 + 5597 =
19. 19.5116 + 3996 =
20. 20.3061 + 6019 =
21. 21.4758 − 1901 =
22. 22.2293 + 4311 =
23. 23.7976 − 2348 =
24. 24.2385 + 1694 =
25. 25.2334 − 1494 =
26. 26.7804 − 6432 =
27. 27.8351 − 2420 =
28. 28.1873 + 4375 =
29. 29.8117 − 7617 =
30. 30.3576 − 2326 =
31. 31.7312 − 5046 =
32. 32.2411 + 3274 =
33. 33.5956 − 1975 =
34. 34.6312 − 1300 =
35. 35.8634 − 5039 =
36. 36.3517 − 1555 =
37. 37.7069 − 1896 =
38. 38.8043 − 1991 =
39. 39.6053 + 1959 =
40. 40.4131 + 6922 =

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