Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 515 · 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: 71 × 76 = 5389. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 27 × 85 = 2292. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 23 × 52 = 1196. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 93 × 94 = 8742. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 13 × 29 = 377. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 648 + 495 = 1143. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 42 × 93 = 3914. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 71 × 40 = 2840. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 59 × 26 = 1534. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 485 + 232 = 713. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 99 × 76 = 7525. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 79 × 35 = 2764. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 491 + 815 = 1306. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 243 + 564 = 807. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 929 + 138 = 1075. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 21 × 51 = 1071. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 27 × 19 = 513. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 17 × 86 = 1462. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 81 × 61 = 4941. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 38 × 23 = 874. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 248 + 152 = 400. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 33 × 61 = 2013. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 45 × 74 = 3323. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 61 × 28 = 1708. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 89 × 15 = 1333. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 37 × 87 = 3219. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 181 + 353 = 538. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 35 × 28 = 986. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 37 × 13 = 482. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 562 + 159 = 713. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 884 + 813 = 1697. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 395 + 649 = 1051. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 55 × 95 = 5225. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 246 + 427 = 673. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 28 × 28 = 777. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 987 + 147 = 1141. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 248 + 992 = 1240. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 417 + 538 = 955. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 13 × 77 = 1001. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 24 × 15 = 365. Correct or wrong? (a) wrong (b) correct

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