Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 580 · 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: 32 × 83 = 2649. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 759 + 866 = 1625. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 30 × 12 = 363. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 500 + 489 = 991. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 22 × 85 = 1870. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 97 × 73 = 7083. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 357 + 903 = 1267. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 44 × 43 = 1892. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 802 + 858 = 1660. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 797 + 411 = 1208. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 131 + 620 = 751. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 459 + 911 = 1370. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 86 × 93 = 8002. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 41 × 81 = 3321. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 559 + 254 = 813. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 86 × 16 = 1376. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 27 × 29 = 783. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 73 × 17 = 1241. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 865 + 358 = 1226. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 156 + 790 = 946. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 77 × 79 = 6083. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 887 + 542 = 1429. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 284 + 350 = 626. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 706 + 785 = 1491. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 57 × 91 = 5187. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 764 + 252 = 1017. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 880 + 336 = 1216. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 163 + 933 = 1090. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 15 × 95 = 1425. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 81 × 34 = 2754. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 413 + 521 = 934. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 925 + 764 = 1692. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 30 × 96 = 2880. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 331 + 959 = 1290. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 34 × 30 = 1021. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 24 × 32 = 760. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 824 + 970 = 1802. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 50 × 55 = 2746. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 63 × 15 = 945. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 486 + 607 = 1093. Correct or wrong? (a) wrong (b) correct

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