Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 920 · 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: 21 × 57 = 1197. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 91 × 77 = 7007. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 208 + 988 = 1196. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 41 × 75 = 3077. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 90 × 26 = 2345. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 12 × 23 = 276. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 69 × 70 = 4838. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 13 × 61 = 794. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 654 + 237 = 891. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 27 × 53 = 1431. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 49 × 23 = 1125. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 657 + 476 = 1131. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 96 × 70 = 6720. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 711 + 132 = 844. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 87 × 92 = 8006. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 42 × 36 = 1512. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 699 + 205 = 904. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 15 × 37 = 555. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 366 + 748 = 1116. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 942 + 727 = 1669. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 728 + 824 = 1552. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 39 × 84 = 3276. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 125 + 540 = 658. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 90 × 19 = 1710. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 81 × 66 = 5346. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 62 × 22 = 1364. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 73 × 12 = 872. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 366 + 550 = 908. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 424 + 356 = 777. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 88 × 89 = 7826. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 98 × 97 = 9506. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 191 + 605 = 796. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 248 + 306 = 554. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 808 + 342 = 1154. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 98 × 89 = 8722. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 511 + 367 = 878. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 49 × 91 = 4459. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 120 + 467 = 590. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 19 × 91 = 1730. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 978 + 742 = 1715. Correct or wrong? (a) correct (b) wrong

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