4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 90 · 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. 1.3378 + 5167 =
2. 2.7076 + 7085 =
3. 3.1591 + 8488 =
4. 4.7811 + 3529 =
5. 5.7412 − 1536 =
6. 6.4679 + 4500 =
7. 7.2957 + 5143 =
8. 8.2495 + 2849 =
9. 9.8951 − 1349 =
10. 10.5340 − 4452 =
11. 11.2909 + 3443 =
12. 12.8422 + 5577 =
13. 13.2553 + 2817 =
14. 14.5568 − 5229 =
15. 15.3394 − 2280 =
16. 16.5929 − 1823 =
17. 17.7533 − 5082 =
18. 18.6074 − 4284 =
19. 19.1270 + 4148 =
20. 20.8515 − 2326 =
21. 21.6711 − 4834 =
22. 22.1323 + 7760 =
23. 23.6001 − 4639 =
24. 24.5824 + 4429 =
25. 25.6618 + 8624 =
26. 26.3334 + 6217 =
27. 27.6562 − 1756 =
28. 28.7697 − 1708 =
29. 29.3536 − 2354 =
30. 30.6285 − 3067 =
31. 31.6268 − 1527 =
32. 32.4772 + 1345 =
33. 33.5676 − 2286 =
34. 34.8783 − 7045 =
35. 35.2073 + 7285 =
36. 36.2411 − 1722 =
37. 37.7234 − 6407 =
38. 38.4700 − 2153 =
39. 39.5386 − 4003 =
40. 40.5451 − 4875 =

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