4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 40 · 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. 1.4730 + 7978 =
2. 2.8201 − 3870 =
3. 3.4012 − 1271 =
4. 4.8468 + 3057 =
5. 5.6888 − 5357 =
6. 6.2983 + 7675 =
7. 7.6768 − 2580 =
8. 8.3870 + 2113 =
9. 9.3268 − 1950 =
10. 10.3235 + 2415 =
11. 11.5251 − 2961 =
12. 12.8405 − 1775 =
13. 13.2248 − 1518 =
14. 14.8650 − 5481 =
15. 15.8188 − 1937 =
16. 16.8756 − 4257 =
17. 17.1141 + 4129 =
18. 18.7614 + 2881 =
19. 19.1790 + 5861 =
20. 20.3843 + 6816 =
21. 21.2651 + 8106 =
22. 22.8857 − 6739 =
23. 23.6724 + 2099 =
24. 24.6646 − 1616 =
25. 25.8880 + 1287 =
26. 26.3008 + 2392 =
27. 27.1816 + 4598 =
28. 28.4701 − 3787 =
29. 29.8715 − 5353 =
30. 30.2027 − 1660 =
31. 31.6082 + 7082 =
32. 32.7471 − 1183 =
33. 33.4462 + 7964 =
34. 34.4909 + 7811 =
35. 35.4161 + 3441 =
36. 36.3223 + 8878 =
37. 37.2171 + 3610 =
38. 38.3396 − 2051 =
39. 39.5923 + 7947 =
40. 40.7425 − 5920 =

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