4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 211 · 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. 1.5874 + 5946 =
2. 2.5744 + 8824 =
3. 3.8255 − 5962 =
4. 4.5697 − 3738 =
5. 5.2991 + 3323 =
6. 6.7560 − 3375 =
7. 7.4051 + 7570 =
8. 8.7045 − 6622 =
9. 9.8117 − 2747 =
10. 10.6070 + 6479 =
11. 11.7512 − 1576 =
12. 12.8970 − 4563 =
13. 13.1445 + 5104 =
14. 14.1296 + 8187 =
15. 15.7134 + 3215 =
16. 16.6776 + 6313 =
17. 17.4131 − 3987 =
18. 18.8593 + 4296 =
19. 19.6077 − 5345 =
20. 20.8472 − 7678 =
21. 21.4211 + 8846 =
22. 22.2872 + 5119 =
23. 23.2148 + 1242 =
24. 24.2190 + 7155 =
25. 25.8588 − 3908 =
26. 26.1233 + 5411 =
27. 27.8047 − 2852 =
28. 28.8151 − 1795 =
29. 29.8077 + 2973 =
30. 30.8166 + 4190 =
31. 31.7775 − 3783 =
32. 32.7637 − 2849 =
33. 33.6660 − 4310 =
34. 34.7037 − 1769 =
35. 35.8331 + 1157 =
36. 36.3089 + 8324 =
37. 37.6405 + 8163 =
38. 38.2017 + 3242 =
39. 39.3762 − 2553 =
40. 40.3893 − 1467 =

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