4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 42 · 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. 1.1282 + 1506 =
2. 2.5515 − 1449 =
3. 3.2430 + 3028 =
4. 4.6672 − 1249 =
5. 5.7215 − 6089 =
6. 6.7651 − 6560 =
7. 7.7529 + 1356 =
8. 8.2357 + 2583 =
9. 9.1390 + 3808 =
10. 10.7809 − 6764 =
11. 11.6880 + 8408 =
12. 12.8827 − 5794 =
13. 13.5840 + 2521 =
14. 14.2454 + 4117 =
15. 15.6736 − 1441 =
16. 16.2699 + 5078 =
17. 17.8074 − 4932 =
18. 18.7857 + 7199 =
19. 19.1327 + 1869 =
20. 20.3223 + 2712 =
21. 21.7526 + 7556 =
22. 22.8028 − 3401 =
23. 23.6957 − 2466 =
24. 24.2966 + 7289 =
25. 25.3132 − 1748 =
26. 26.7766 − 2119 =
27. 27.4938 + 4079 =
28. 28.5188 − 1195 =
29. 29.7991 − 4409 =
30. 30.4810 − 2146 =
31. 31.3969 + 3432 =
32. 32.8031 + 6247 =
33. 33.1910 + 2062 =
34. 34.5166 − 1696 =
35. 35.5178 − 1847 =
36. 36.3063 + 2393 =
37. 37.6526 + 2327 =
38. 38.1439 + 3484 =
39. 39.5743 + 1801 =
40. 40.3270 + 8442 =

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