4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 45 · 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. 1.2184 + 1931 =
2. 2.8453 − 3173 =
3. 3.8692 − 1300 =
4. 4.4015 − 3544 =
5. 5.5319 − 2634 =
6. 6.6984 + 1354 =
7. 7.2668 − 1346 =
8. 8.7766 + 4823 =
9. 9.3419 + 7210 =
10. 10.6384 − 1982 =
11. 11.3399 − 2281 =
12. 12.8893 − 7045 =
13. 13.7937 − 5542 =
14. 14.3387 − 3304 =
15. 15.7778 + 7678 =
16. 16.2057 − 1256 =
17. 17.3452 − 3345 =
18. 18.5834 + 7291 =
19. 19.6119 + 7837 =
20. 20.2312 − 1697 =
21. 21.6489 + 4958 =
22. 22.7877 − 4619 =
23. 23.2708 + 5853 =
24. 24.3356 − 3092 =
25. 25.6185 − 2621 =
26. 26.8472 + 6512 =
27. 27.4718 + 6282 =
28. 28.7696 + 3888 =
29. 29.7234 − 1419 =
30. 30.2005 + 4848 =
31. 31.7317 + 7197 =
32. 32.6897 − 5771 =
33. 33.4153 + 5089 =
34. 34.6343 + 2972 =
35. 35.7147 + 2913 =
36. 36.7163 + 2289 =
37. 37.2278 + 3448 =
38. 38.7399 − 5335 =
39. 39.7892 − 2206 =
40. 40.5714 + 4116 =

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