4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 198 · 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. 1.4065 + 6402 =
2. 2.1386 + 3466 =
3. 3.8319 − 6341 =
4. 4.1635 + 5520 =
5. 5.6304 + 7943 =
6. 6.5549 + 7609 =
7. 7.6993 − 2540 =
8. 8.7647 + 6307 =
9. 9.4679 + 2235 =
10. 10.3894 + 2525 =
11. 11.5085 + 4916 =
12. 12.2228 − 1447 =
13. 13.6651 − 6314 =
14. 14.8680 − 2996 =
15. 15.7176 − 6946 =
16. 16.2461 + 1277 =
17. 17.3930 + 6279 =
18. 18.5332 − 4108 =
19. 19.7898 − 3522 =
20. 20.1206 + 5196 =
21. 21.8039 − 4106 =
22. 22.7173 − 1231 =
23. 23.8879 − 6445 =
24. 24.2590 − 1511 =
25. 25.6458 + 6072 =
26. 26.5627 + 3798 =
27. 27.4252 + 5069 =
28. 28.6103 − 2461 =
29. 29.2524 + 4378 =
30. 30.8995 − 4752 =
31. 31.7054 − 5085 =
32. 32.5463 − 4118 =
33. 33.4560 − 1997 =
34. 34.1946 + 1458 =
35. 35.7794 − 2641 =
36. 36.4784 + 2902 =
37. 37.6846 + 6749 =
38. 38.7421 − 6148 =
39. 39.5781 − 1899 =
40. 40.2405 + 5070 =

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