4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 204 · 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. 1.1934 + 1271 =
2. 2.2442 + 8317 =
3. 3.6197 − 4923 =
4. 4.8345 − 1948 =
5. 5.4932 + 1276 =
6. 6.8236 − 1705 =
7. 7.2653 + 6309 =
8. 8.5980 + 7893 =
9. 9.2295 + 1874 =
10. 10.7608 − 7115 =
11. 11.6101 − 5113 =
12. 12.2111 + 7128 =
13. 13.4632 + 1199 =
14. 14.2859 + 2369 =
15. 15.2885 − 2501 =
16. 16.7471 − 1693 =
17. 17.3350 − 2474 =
18. 18.4605 + 2386 =
19. 19.8685 + 8961 =
20. 20.8586 − 3305 =
21. 21.4261 − 2204 =
22. 22.5871 + 6984 =
23. 23.8299 + 7670 =
24. 24.6858 + 8787 =
25. 25.3240 + 2457 =
26. 26.1706 + 3326 =
27. 27.3969 + 3522 =
28. 28.5249 − 2477 =
29. 29.3494 + 1227 =
30. 30.3076 + 3620 =
31. 31.2850 − 1124 =
32. 32.7599 + 2129 =
33. 33.1570 + 1561 =
34. 34.8292 − 6128 =
35. 35.7656 − 4066 =
36. 36.6800 + 1477 =
37. 37.1979 + 4995 =
38. 38.8461 + 1423 =
39. 39.8397 + 6754 =
40. 40.1325 + 2430 =

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