Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 980 · 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: 98 × 80 = 7840. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 246 + 730 = 980. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 17 × 77 = 1309. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 563 + 877 = 1440. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 29 × 80 = 2320. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 64 × 97 = 6208. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 40 × 61 = 2434. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 658 + 246 = 904. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 83 × 91 = 7554. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 47 × 99 = 4653. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 512 + 704 = 1216. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 23 × 60 = 1380. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 85 × 52 = 4420. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 471 + 288 = 758. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 980 + 227 = 1207. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 57 × 77 = 4393. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 26 × 35 = 910. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 918 + 825 = 1743. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 987 + 966 = 1957. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 57 × 45 = 2564. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 55 × 96 = 5280. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 73 × 18 = 1314. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 67 × 35 = 2338. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 49 × 54 = 2646. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 329 + 416 = 753. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 26 × 69 = 1794. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 79 × 68 = 5371. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 39 × 24 = 936. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 28 × 98 = 2751. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 426 + 577 = 999. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 92 × 33 = 3036. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 48 × 33 = 1584. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 61 × 96 = 5853. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 54 × 17 = 914. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 162 + 121 = 283. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 375 + 448 = 823. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 48 × 31 = 1491. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 48 × 78 = 3738. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 52 × 80 = 4162. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 572 + 921 = 1493. Correct or wrong? (a) wrong (b) correct

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