4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 210 · 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. 1.8080 + 7831 =
2. 2.8931 − 1728 =
3. 3.3603 − 3216 =
4. 4.5994 − 5671 =
5. 5.4250 − 3202 =
6. 6.8223 − 3983 =
7. 7.5864 + 3651 =
8. 8.3231 − 1188 =
9. 9.4048 − 3991 =
10. 10.4146 + 7527 =
11. 11.5493 + 3184 =
12. 12.8473 + 7938 =
13. 13.8275 + 5832 =
14. 14.1718 − 1273 =
15. 15.3400 + 8232 =
16. 16.3786 − 1166 =
17. 17.7195 − 5263 =
18. 18.3263 − 2937 =
19. 19.2534 + 5535 =
20. 20.5009 + 3615 =
21. 21.7291 − 7076 =
22. 22.5028 − 3119 =
23. 23.2998 − 2168 =
24. 24.1840 + 7677 =
25. 25.6347 + 3298 =
26. 26.8175 + 4843 =
27. 27.7754 + 6451 =
28. 28.7896 + 6509 =
29. 29.3358 + 6914 =
30. 30.4716 + 1147 =
31. 31.1726 + 5383 =
32. 32.7404 + 2201 =
33. 33.8630 − 3871 =
34. 34.2731 + 6036 =
35. 35.4676 − 1801 =
36. 36.8069 − 2957 =
37. 37.7731 − 1309 =
38. 38.4070 − 3566 =
39. 39.7268 + 3507 =
40. 40.7588 + 1909 =

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