4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 21 · 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. 1.7399 − 3943 =
2. 2.4575 − 3627 =
3. 3.7034 + 1835 =
4. 4.8015 − 4015 =
5. 5.2116 + 6109 =
6. 6.4921 − 1734 =
7. 7.6849 − 5815 =
8. 8.2536 − 2053 =
9. 9.2849 + 7358 =
10. 10.2766 − 1796 =
11. 11.7222 − 4514 =
12. 12.4768 − 2026 =
13. 13.7214 + 1901 =
14. 14.5176 + 2191 =
15. 15.4182 + 8810 =
16. 16.8752 + 6066 =
17. 17.6598 − 5347 =
18. 18.6114 − 3025 =
19. 19.5280 + 5816 =
20. 20.3150 + 2705 =
21. 21.2300 + 6725 =
22. 22.1539 + 2096 =
23. 23.2883 + 3428 =
24. 24.8854 − 1191 =
25. 25.7427 − 1729 =
26. 26.8436 − 3682 =
27. 27.8548 + 3570 =
28. 28.8166 + 2710 =
29. 29.8665 − 2550 =
30. 30.5669 − 3307 =
31. 31.2183 − 2173 =
32. 32.1612 + 1399 =
33. 33.1712 + 1350 =
34. 34.5857 − 5846 =
35. 35.3230 + 2716 =
36. 36.4165 + 8735 =
37. 37.6624 + 5745 =
38. 38.5117 + 1183 =
39. 39.1451 + 4612 =
40. 40.5915 + 1755 =

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