4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 47 · 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. 1.8288 + 5986 =
2. 2.5979 − 2740 =
3. 3.6088 − 4473 =
4. 4.7615 + 4505 =
5. 5.6854 + 6016 =
6. 6.7007 − 2002 =
7. 7.6526 − 2641 =
8. 8.7568 − 2039 =
9. 9.2128 + 7933 =
10. 10.5265 + 8120 =
11. 11.4963 − 2467 =
12. 12.2463 + 8032 =
13. 13.2789 + 8806 =
14. 14.8024 + 2432 =
15. 15.1138 + 4544 =
16. 16.8740 − 7069 =
17. 17.4734 − 1939 =
18. 18.1484 − 1201 =
19. 19.4110 + 1751 =
20. 20.1259 + 4125 =
21. 21.6285 − 2757 =
22. 22.7518 − 1191 =
23. 23.8462 − 2886 =
24. 24.3472 + 8916 =
25. 25.8606 − 6494 =
26. 26.4038 + 3637 =
27. 27.5290 − 2459 =
28. 28.5540 + 2053 =
29. 29.3264 + 8213 =
30. 30.5675 − 2890 =
31. 31.8620 + 6505 =
32. 32.6177 − 1571 =
33. 33.5242 + 1524 =
34. 34.5765 − 2692 =
35. 35.6758 + 6478 =
36. 36.2701 + 8981 =
37. 37.8582 − 4040 =
38. 38.6740 − 1788 =
39. 39.3327 − 1227 =
40. 40.8211 + 7822 =

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