Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 51 · 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: 17 × 77 = 1309. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 73 × 97 = 7083. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 85 × 35 = 2982. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 94 × 66 = 6204. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 69 × 14 = 966. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 86 × 55 = 4730. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 89 × 18 = 1602. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 76 × 96 = 7301. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 474 + 782 = 1251. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 749 + 447 = 1200. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 808 + 543 = 1351. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 987 + 875 = 1862. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 810 + 868 = 1674. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 800 + 773 = 1573. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 142 + 140 = 274. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 31 × 86 = 2666. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 997 + 689 = 1686. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 73 × 31 = 2270. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 89 × 77 = 6853. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 979 + 819 = 1803. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 88 × 46 = 4048. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 569 + 537 = 1108. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 54 × 54 = 2916. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 986 + 312 = 1300. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 89 × 63 = 5612. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 124 + 809 = 933. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 79 × 87 = 6873. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 38 × 28 = 1070. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 921 + 452 = 1367. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 31 × 79 = 2449. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 143 + 353 = 496. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 17 × 96 = 1632. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 553 + 305 = 858. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 388 + 478 = 866. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 914 + 166 = 1087. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 197 + 912 = 1102. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 75 × 21 = 1575. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 82 × 77 = 6314. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 311 + 553 = 869. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 72 × 93 = 6696. Correct or wrong? (a) correct (b) wrong

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