Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 41 · 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: 63 × 42 = 2646. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 27 × 38 = 1029. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 60 × 89 = 5340. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 91 × 34 = 3092. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 474 + 674 = 1150. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 67 × 95 = 6364. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 463 + 596 = 1059. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 67 × 77 = 5159. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 328 + 872 = 1201. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 26 × 66 = 1715. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 85 × 34 = 2890. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 159 + 574 = 733. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 486 + 364 = 845. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 99 × 15 = 1485. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 72 × 19 = 1376. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 32 × 89 = 2849. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 98 × 97 = 9506. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 649 + 663 = 1317. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 73 × 71 = 5190. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 26 × 21 = 546. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 875 + 732 = 1607. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 90 × 19 = 1710. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 857 + 538 = 1397. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 16 × 25 = 400. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 97 × 44 = 4268. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 37 × 40 = 1484. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 51 × 35 = 1785. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 41 × 27 = 1113. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 17 × 70 = 1184. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 57 × 81 = 4617. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 406 + 417 = 823. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 74 × 76 = 5629. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 33 × 98 = 3237. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 351 + 884 = 1231. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 78 × 86 = 6708. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 677 + 779 = 1456. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 806 + 358 = 1161. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 28 × 81 = 2261. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 362 + 900 = 1265. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 377 + 333 = 710. Correct or wrong? (a) wrong (b) correct

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