4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 56 · 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. 1.3568 + 2840 =
2. 2.4299 − 1914 =
3. 3.4094 − 3675 =
4. 4.7844 + 3954 =
5. 5.6418 + 3723 =
6. 6.8257 + 7559 =
7. 7.6612 + 4853 =
8. 8.3917 − 1523 =
9. 9.4383 − 3485 =
10. 10.6303 − 5720 =
11. 11.2490 − 2064 =
12. 12.2936 + 4714 =
13. 13.3279 + 3205 =
14. 14.6759 + 8404 =
15. 15.5824 + 5327 =
16. 16.6613 + 5869 =
17. 17.8455 − 6686 =
18. 18.1999 − 1907 =
19. 19.5739 + 1607 =
20. 20.3677 − 2654 =
21. 21.8227 + 1732 =
22. 22.6411 − 1695 =
23. 23.5245 + 7792 =
24. 24.1171 + 5179 =
25. 25.8381 − 3321 =
26. 26.8666 − 4105 =
27. 27.4046 + 5885 =
28. 28.7120 − 6912 =
29. 29.4922 + 7523 =
30. 30.8408 − 3580 =
31. 31.4249 + 1480 =
32. 32.6194 − 1669 =
33. 33.5790 + 2018 =
34. 34.3608 + 3771 =
35. 35.4584 − 3278 =
36. 36.8423 + 2911 =
37. 37.6286 − 4957 =
38. 38.2872 + 4392 =
39. 39.7595 − 2304 =
40. 40.1429 − 1190 =

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