4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 155 · 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. 1.5331 − 1217 =
2. 2.5787 + 2925 =
3. 3.5991 + 1601 =
4. 4.8244 + 8443 =
5. 5.5636 − 2821 =
6. 6.1315 + 8871 =
7. 7.8164 − 8099 =
8. 8.8020 − 4588 =
9. 9.4542 + 4381 =
10. 10.7553 + 5393 =
11. 11.3530 + 5905 =
12. 12.8723 − 1993 =
13. 13.1509 + 7222 =
14. 14.5927 − 1326 =
15. 15.7557 − 4380 =
16. 16.4250 + 1911 =
17. 17.8478 + 1831 =
18. 18.7185 + 6932 =
19. 19.6172 − 3457 =
20. 20.3295 − 1157 =
21. 21.2838 − 2252 =
22. 22.8535 − 8515 =
23. 23.7046 + 4002 =
24. 24.2718 − 1481 =
25. 25.3485 − 1400 =
26. 26.7879 + 1448 =
27. 27.2928 − 1701 =
28. 28.2847 + 5189 =
29. 29.1278 + 5107 =
30. 30.8451 + 8220 =
31. 31.1469 + 8101 =
32. 32.4967 + 2705 =
33. 33.6077 − 3899 =
34. 34.8268 − 2580 =
35. 35.2839 + 6922 =
36. 36.5515 + 3082 =
37. 37.8406 − 7992 =
38. 38.1676 + 3260 =
39. 39.1241 + 3989 =
40. 40.7652 − 1186 =

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