Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 405 · 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: 61 × 64 = 3903. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 739 + 955 = 1694. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 43 × 36 = 1548. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 175 + 556 = 731. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 69 × 17 = 1173. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 410 + 155 = 565. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 32 × 89 = 2843. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 35 × 13 = 449. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 56 × 13 = 728. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 26 × 19 = 494. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 545 + 531 = 1076. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 73 × 17 = 1242. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 94 × 68 = 6400. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 782 + 993 = 1775. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 835 + 929 = 1764. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 66 × 23 = 1522. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 150 + 624 = 772. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 46 × 39 = 1794. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 698 + 249 = 947. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 28 × 90 = 2520. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 242 + 687 = 927. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 98 × 39 = 3822. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 15 × 32 = 480. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 93 × 78 = 7254. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 911 + 593 = 1505. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 85 × 50 = 4250. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 428 + 859 = 1288. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 32 × 20 = 640. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 79 × 28 = 2212. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 81 × 27 = 2184. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 211 + 782 = 991. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 94 × 52 = 4888. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 629 + 137 = 762. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 588 + 809 = 1394. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 33 × 74 = 2442. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 74 × 88 = 6515. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 185 + 506 = 689. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 665 + 256 = 924. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 67 × 26 = 1737. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 852 + 905 = 1757. Correct or wrong? (a) wrong (b) correct

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