Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 202 · 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: 33 × 53 = 1756. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 95 × 67 = 6365. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 911 + 740 = 1651. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 70 × 79 = 5526. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 98 × 26 = 2551. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 27 × 66 = 1781. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 32 × 75 = 2397. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 78 × 16 = 1248. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 41 × 67 = 2752. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 575 + 728 = 1303. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 304 + 607 = 918. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 751 + 728 = 1479. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 465 + 534 = 1000. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 18 × 52 = 936. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 80 × 83 = 6640. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 93 × 68 = 6324. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 740 + 365 = 1111. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 20 × 33 = 660. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 180 + 497 = 669. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 364 + 335 = 699. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 97 × 29 = 2818. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 139 + 249 = 388. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 51 × 61 = 3111. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 448 + 744 = 1184. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 21 × 96 = 2021. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 31 × 63 = 1953. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 41 × 61 = 2506. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 168 + 699 = 867. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 40 × 82 = 3281. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 14 × 34 = 476. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 35 × 35 = 1228. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 21 × 50 = 1050. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 89 × 35 = 3117. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 22 × 55 = 1211. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 40 × 20 = 800. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 14 × 98 = 1373. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 619 + 367 = 986. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 39 × 81 = 3159. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 60 × 20 = 1200. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 86 × 68 = 5848. Correct or wrong? (a) correct (b) wrong

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