4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 187 · 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. 1.8282 − 4078 =
2. 2.3615 + 7134 =
3. 3.6624 + 2639 =
4. 4.4819 + 2780 =
5. 5.2932 − 2087 =
6. 6.1799 + 8986 =
7. 7.2262 − 1187 =
8. 8.7168 − 1125 =
9. 9.6612 + 2514 =
10. 10.4912 − 4866 =
11. 11.5469 + 5829 =
12. 12.3810 + 6872 =
13. 13.5953 + 5928 =
14. 14.7247 − 4954 =
15. 15.2880 + 7563 =
16. 16.6197 + 3524 =
17. 17.7607 + 7137 =
18. 18.4270 − 1675 =
19. 19.5555 + 4606 =
20. 20.5459 + 1803 =
21. 21.2326 + 1174 =
22. 22.2505 − 1303 =
23. 23.4547 − 2263 =
24. 24.4603 − 4132 =
25. 25.3493 + 8535 =
26. 26.5489 − 1484 =
27. 27.3273 + 5939 =
28. 28.6653 − 2582 =
29. 29.8522 − 2833 =
30. 30.7647 + 8571 =
31. 31.6563 − 2325 =
32. 32.8162 + 5374 =
33. 33.2672 − 1460 =
34. 34.2857 + 4142 =
35. 35.7657 − 4366 =
36. 36.5281 − 4411 =
37. 37.1518 − 1165 =
38. 38.8014 − 1614 =
39. 39.1862 + 3796 =
40. 40.8382 + 4249 =

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