4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 162 · 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. 1.7296 − 6516 =
2. 2.3918 + 8359 =
3. 3.4578 + 5705 =
4. 4.1580 + 6104 =
5. 5.2871 − 2127 =
6. 6.4737 − 1432 =
7. 7.3293 − 1888 =
8. 8.7967 − 3934 =
9. 9.3003 − 2716 =
10. 10.8641 − 4385 =
11. 11.2269 + 4472 =
12. 12.1938 − 1600 =
13. 13.7011 − 5747 =
14. 14.5577 + 6256 =
15. 15.6588 + 8008 =
16. 16.8488 + 3186 =
17. 17.2553 + 4669 =
18. 18.4537 + 6576 =
19. 19.7516 − 1613 =
20. 20.2482 + 8990 =
21. 21.4232 − 2400 =
22. 22.8695 + 2539 =
23. 23.7350 − 2047 =
24. 24.3900 − 3764 =
25. 25.3117 + 3371 =
26. 26.7023 + 6957 =
27. 27.7588 − 1920 =
28. 28.7010 − 2092 =
29. 29.1939 + 1289 =
30. 30.8511 − 1303 =
31. 31.1269 + 3914 =
32. 32.7254 − 6630 =
33. 33.4427 + 1908 =
34. 34.3424 − 3036 =
35. 35.2694 + 1871 =
36. 36.4553 + 8870 =
37. 37.4333 − 2613 =
38. 38.6272 − 1826 =
39. 39.3865 + 3530 =
40. 40.2654 − 1166 =

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