4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 82 · 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. 1.1829 + 5218 =
2. 2.4200 + 7738 =
3. 3.8134 − 6170 =
4. 4.7109 − 4219 =
5. 5.6454 + 1290 =
6. 6.4462 + 1451 =
7. 7.7463 + 7569 =
8. 8.8145 + 8734 =
9. 9.6900 − 1470 =
10. 10.6410 − 1281 =
11. 11.3318 − 3193 =
12. 12.8964 + 2117 =
13. 13.5520 − 1391 =
14. 14.1304 + 5188 =
15. 15.7816 − 7722 =
16. 16.5031 + 5396 =
17. 17.8451 + 1819 =
18. 18.8567 − 6236 =
19. 19.4656 − 4576 =
20. 20.3819 − 1710 =
21. 21.1712 + 5589 =
22. 22.5334 + 3344 =
23. 23.4023 + 1386 =
24. 24.5247 + 4479 =
25. 25.5119 + 1569 =
26. 26.2519 − 1130 =
27. 27.6360 − 1828 =
28. 28.4702 − 4245 =
29. 29.3210 + 6017 =
30. 30.4652 + 7205 =
31. 31.2352 − 2256 =
32. 32.7942 + 5948 =
33. 33.1484 + 8937 =
34. 34.1423 − 1209 =
35. 35.2123 + 7652 =
36. 36.5380 + 3409 =
37. 37.2930 + 3050 =
38. 38.1813 + 2996 =
39. 39.8869 − 4928 =
40. 40.1405 + 6563 =

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