Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 965 · 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: 84 × 70 = 5887. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 20 × 85 = 1700. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 77 × 13 = 1003. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 37 × 76 = 2812. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 54 × 85 = 4590. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 64 × 28 = 1792. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 27 × 86 = 2322. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 34 × 87 = 2957. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 261 + 313 = 581. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 79 × 17 = 1343. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 85 × 60 = 5093. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 31 × 36 = 1116. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 23 × 60 = 1380. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 72 × 82 = 5904. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 83 × 31 = 2574. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 27 × 52 = 1405. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 18 × 54 = 972. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 68 × 74 = 5033. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 623 + 196 = 819. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 74 × 92 = 6814. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 927 + 847 = 1774. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 839 + 383 = 1222. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 70 × 99 = 6929. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 779 + 753 = 1532. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 94 × 23 = 2170. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 88 × 84 = 7392. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 46 × 34 = 1557. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 12 × 64 = 770. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 945 + 717 = 1662. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 58 × 58 = 3363. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 23 × 18 = 414. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 986 + 472 = 1458. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 826 + 402 = 1228. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 82 × 39 = 3198. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 835 + 129 = 967. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 16 × 77 = 1238. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 795 + 720 = 1515. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 25 × 66 = 1654. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 27 × 53 = 1431. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 187 + 559 = 746. Correct or wrong? (a) correct (b) wrong

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