4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 147 · 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. 1.7574 + 6106 =
2. 2.7389 − 2157 =
3. 3.5468 − 3467 =
4. 4.8245 − 5127 =
5. 5.8639 − 5816 =
6. 6.8503 − 2007 =
7. 7.7236 − 6536 =
8. 8.7516 + 8645 =
9. 9.2432 + 3293 =
10. 10.4417 − 1628 =
11. 11.8624 − 3017 =
12. 12.5859 − 1984 =
13. 13.3115 + 7722 =
14. 14.3353 + 3939 =
15. 15.7627 + 4302 =
16. 16.7834 − 5141 =
17. 17.1259 + 8569 =
18. 18.7283 − 1192 =
19. 19.1149 + 8634 =
20. 20.2050 + 2518 =
21. 21.8529 − 3401 =
22. 22.7242 − 3087 =
23. 23.7019 − 4383 =
24. 24.5779 + 1529 =
25. 25.4098 + 3816 =
26. 26.8838 − 2978 =
27. 27.7102 + 5601 =
28. 28.6066 − 1354 =
29. 29.2719 + 6620 =
30. 30.5562 − 1449 =
31. 31.1767 + 6038 =
32. 32.6374 + 3017 =
33. 33.6592 + 2056 =
34. 34.8147 + 3884 =
35. 35.8535 + 1355 =
36. 36.7563 − 1878 =
37. 37.7238 + 8054 =
38. 38.3782 − 2560 =
39. 39.2976 − 1994 =
40. 40.4950 + 1206 =

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