Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 554 · 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: 25 × 28 = 700. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 20 × 56 = 1120. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 86 × 57 = 4902. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 31 × 63 = 1953. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 272 + 616 = 888. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 68 × 56 = 3808. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 29 × 87 = 2531. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 580 + 602 = 1182. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 619 + 880 = 1506. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 25 × 53 = 1333. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 68 × 81 = 5510. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 687 + 806 = 1486. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 23 × 73 = 1679. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 74 × 95 = 7034. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 68 × 33 = 2242. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 19 × 31 = 589. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 789 + 455 = 1242. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 70 × 74 = 5180. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 242 + 930 = 1172. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 55 × 12 = 660. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 182 + 202 = 381. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 59 × 62 = 3660. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 82 × 97 = 7957. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 39 × 88 = 3424. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 23 × 30 = 694. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 28 × 64 = 1798. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 585 + 828 = 1413. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 77 × 76 = 5854. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 71 × 18 = 1280. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 52 × 28 = 1456. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 174 + 901 = 1072. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 67 × 97 = 6500. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 596 + 208 = 808. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 39 × 60 = 2340. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 51 × 82 = 4180. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 229 + 404 = 633. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 649 + 725 = 1371. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 76 × 60 = 4558. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 272 + 614 = 893. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 248 + 754 = 1003. Correct or wrong? (a) wrong (b) correct

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