4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 107 · 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. 1.6471 + 3711 =
2. 2.6359 − 1104 =
3. 3.6345 − 3691 =
4. 4.8775 − 3283 =
5. 5.1766 + 4708 =
6. 6.3917 + 5261 =
7. 7.2757 + 1380 =
8. 8.4692 + 4079 =
9. 9.8244 + 7735 =
10. 10.5240 + 1254 =
11. 11.5361 − 1441 =
12. 12.7006 + 3881 =
13. 13.3857 − 1395 =
14. 14.7474 + 8134 =
15. 15.6099 − 1488 =
16. 16.6260 − 3095 =
17. 17.4514 + 3753 =
18. 18.4374 + 2111 =
19. 19.1343 + 5781 =
20. 20.1321 + 7143 =
21. 21.4224 − 2732 =
22. 22.8914 + 8576 =
23. 23.7492 − 2154 =
24. 24.2175 − 1432 =
25. 25.7290 − 6873 =
26. 26.8497 + 2069 =
27. 27.7450 − 1469 =
28. 28.5443 − 1849 =
29. 29.7156 + 3548 =
30. 30.5205 − 4358 =
31. 31.1304 + 6779 =
32. 32.6914 − 4982 =
33. 33.1685 + 4123 =
34. 34.7681 + 3273 =
35. 35.8034 − 1207 =
36. 36.5723 − 3853 =
37. 37.2633 + 6627 =
38. 38.2943 + 6303 =
39. 39.1334 + 8082 =
40. 40.8935 + 4597 =

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths