Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 334 · 40 questions

The fast method (Casting out nines): Find the nine-check number of each number: add the digits until one digit is left. Do the same sum (× or +) with those digits and shrink the result to one digit too. Shrink the given answer. Different → wrong. Same → it passes the check.

1. 1.Check with nines: 24 × 72 = 1728. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 68 × 55 = 3738. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 886 + 186 = 1072. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 89 × 45 = 4001. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 638 + 876 = 1514. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 55 × 75 = 4127. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 186 + 441 = 627. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 157 + 961 = 1118. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 65 × 40 = 2592. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 19 × 14 = 266. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 73 × 37 = 2695. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 63 × 22 = 1379. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 304 + 712 = 1016. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 239 + 835 = 1074. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 23 × 66 = 1519. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 22 × 33 = 721. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 12 × 70 = 840. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 26 × 32 = 832. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 351 + 329 = 677. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 71 × 29 = 2057. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 43 × 69 = 2967. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 612 + 924 = 1531. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 923 + 895 = 1823. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 86 × 30 = 2588. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 42 × 26 = 1084. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 30 × 26 = 785. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 79 × 89 = 7024. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 559 + 242 = 801. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 303 + 946 = 1241. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 58 × 66 = 3820. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 66 × 29 = 1912. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 91 × 46 = 4186. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 80 × 91 = 7280. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 276 + 937 = 1211. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 42 × 31 = 1308. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 405 + 519 = 924. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 52 × 81 = 4212. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 231 + 442 = 673. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 763 + 202 = 965. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 607 + 128 = 732. Correct or wrong? (a) correct (b) wrong

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