4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 200 · 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. 1.2010 + 8712 =
2. 2.7142 − 5014 =
3. 3.2521 − 1212 =
4. 4.6735 − 2009 =
5. 5.1790 + 2379 =
6. 6.1340 + 2857 =
7. 7.8863 − 3973 =
8. 8.4017 + 5411 =
9. 9.8210 − 7154 =
10. 10.4976 + 5350 =
11. 11.2671 + 2561 =
12. 12.7637 − 7570 =
13. 13.7788 + 3155 =
14. 14.8772 − 5092 =
15. 15.5454 − 2044 =
16. 16.1610 − 1172 =
17. 17.7180 − 3536 =
18. 18.8522 − 2482 =
19. 19.7038 + 3670 =
20. 20.5031 − 2918 =
21. 21.2412 − 2030 =
22. 22.1538 + 7171 =
23. 23.7943 − 6510 =
24. 24.2202 + 3186 =
25. 25.1326 + 4171 =
26. 26.8052 − 1383 =
27. 27.7409 − 6372 =
28. 28.3823 + 3933 =
29. 29.2830 + 7201 =
30. 30.8800 − 3290 =
31. 31.4107 + 5619 =
32. 32.6109 − 1495 =
33. 33.8219 + 3428 =
34. 34.1831 + 4958 =
35. 35.5352 + 6996 =
36. 36.6821 + 4227 =
37. 37.5017 + 7786 =
38. 38.1590 + 1485 =
39. 39.6576 + 4463 =
40. 40.2668 − 2219 =

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