Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 556 · 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: 20 × 12 = 240. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 52 × 16 = 832. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 800 + 472 = 1264. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 60 × 36 = 2160. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 456 + 283 = 739. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 22 × 74 = 1628. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 75 × 86 = 6450. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 67 × 93 = 6231. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 591 + 374 = 965. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 987 + 842 = 1832. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 132 + 168 = 304. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 16 × 81 = 1297. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 333 + 660 = 986. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 37 × 73 = 2704. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 79 × 89 = 7031. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 28 × 48 = 1344. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 94 × 39 = 3659. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 49 × 28 = 1365. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 124 + 388 = 512. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 82 × 81 = 6636. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 920 + 141 = 1061. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 957 + 793 = 1750. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 574 + 402 = 976. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 29 × 64 = 1852. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 496 + 161 = 657. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 183 + 652 = 836. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 971 + 635 = 1613. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 25 × 44 = 1100. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 77 × 76 = 5852. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 842 + 582 = 1431. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 88 × 41 = 3608. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 41 × 81 = 3321. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 394 + 874 = 1274. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 18 × 33 = 594. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 723 + 446 = 1174. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 27 × 70 = 1888. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 30 × 64 = 1920. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 583 + 928 = 1507. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 667 + 707 = 1376. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 33 × 48 = 1584. Correct or wrong? (a) correct (b) wrong

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