Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 90 · 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: 34 × 94 = 3197. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 47 × 62 = 2915. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 287 + 701 = 987. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 225 + 683 = 908. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 41 × 30 = 1232. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 65 × 31 = 2015. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 443 + 435 = 878. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 635 + 434 = 1068. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 568 + 768 = 1336. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 167 + 865 = 1035. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 419 + 166 = 583. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 549 + 773 = 1322. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 476 + 518 = 994. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 327 + 149 = 469. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 87 × 49 = 4263. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 327 + 360 = 687. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 29 × 35 = 1017. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 97 × 78 = 7563. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 228 + 329 = 554. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 544 + 323 = 867. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 31 × 99 = 3069. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 363 + 460 = 823. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 67 × 53 = 3551. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 24 × 15 = 360. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 428 + 653 = 1081. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 413 + 683 = 1096. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 977 + 400 = 1377. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 869 + 172 = 1033. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 59 × 40 = 2360. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 87 × 20 = 1739. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 574 + 226 = 800. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 42 × 43 = 1814. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 45 × 83 = 3735. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 98 × 32 = 3141. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 18 × 31 = 558. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 507 + 564 = 1071. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 978 + 922 = 1905. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 724 + 160 = 887. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 775 + 509 = 1284. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 790 + 756 = 1546. Correct or wrong? (a) wrong (b) correct

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