Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 261 · 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: 905 + 515 = 1421. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 40 × 44 = 1753. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 84 × 85 = 7140. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 461 + 910 = 1374. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 92 × 25 = 2307. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 53 × 54 = 2862. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 945 + 875 = 1820. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 478 + 348 = 827. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 13 × 59 = 768. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 79 × 22 = 1738. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 40 × 97 = 3874. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 724 + 159 = 880. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 418 + 751 = 1166. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 40 × 27 = 1081. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 151 + 581 = 732. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 924 + 345 = 1262. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 368 + 246 = 614. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 836 + 151 = 994. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 21 × 14 = 294. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 824 + 385 = 1209. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 25 × 70 = 1750. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 21 × 43 = 911. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 945 + 829 = 1774. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 413 + 143 = 556. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 91 × 17 = 1545. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 18 × 97 = 1751. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 31 × 44 = 1365. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 61 × 33 = 2018. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 565 + 733 = 1298. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 26 × 86 = 2238. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 359 + 415 = 774. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 720 + 787 = 1510. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 28 × 24 = 667. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 99 × 99 = 9802. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 365 + 464 = 825. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 952 + 876 = 1828. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 25 × 31 = 775. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 36 × 74 = 2667. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 94 × 37 = 3478. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 730 + 213 = 941. Correct or wrong? (a) correct (b) wrong

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