Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 844 · 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: 59 × 81 = 4779. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 61 × 58 = 3541. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 25 × 12 = 300. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 43 × 89 = 3830. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 29 × 13 = 377. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 58 × 28 = 1631. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 41 × 36 = 1479. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 40 × 87 = 3488. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 63 × 23 = 1455. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 822 + 185 = 1007. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 86 × 75 = 6450. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 872 + 215 = 1087. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 97 × 83 = 8045. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 63 × 36 = 2270. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 957 + 871 = 1832. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 224 + 485 = 712. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 285 + 828 = 1113. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 768 + 841 = 1609. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 32 × 96 = 3072. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 278 + 785 = 1061. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 13 × 12 = 153. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 183 + 595 = 779. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 70 × 15 = 1050. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 74 × 90 = 6660. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 940 + 721 = 1655. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 48 × 26 = 1248. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 844 + 977 = 1821. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 62 × 48 = 2977. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 41 × 86 = 3522. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 667 + 741 = 1403. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 66 × 91 = 6006. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 30 × 62 = 1860. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 499 + 722 = 1224. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 579 + 672 = 1244. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 791 + 484 = 1274. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 95 × 32 = 3040. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 89 × 15 = 1335. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 20 × 85 = 1700. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 17 × 39 = 666. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 81 × 29 = 2349. Correct or wrong? (a) wrong (b) correct

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