Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 582 · 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: 925 + 351 = 1276. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 730 + 267 = 996. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 78 × 87 = 6786. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 95 × 15 = 1418. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 43 × 91 = 3918. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 695 + 971 = 1664. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 54 × 92 = 4968. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 242 + 321 = 563. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 621 + 445 = 1066. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 13 × 86 = 1118. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 450 + 724 = 1180. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 57 × 57 = 3249. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 40 × 75 = 2998. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 38 × 31 = 1178. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 78 × 91 = 7098. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 51 × 87 = 4435. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 568 + 301 = 868. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 803 + 811 = 1614. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 65 × 34 = 2210. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 161 + 929 = 1090. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 21 × 78 = 1638. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 740 + 498 = 1238. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 39 × 94 = 3663. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 55 × 72 = 3965. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 128 + 544 = 672. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 413 + 675 = 1090. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 326 + 868 = 1194. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 93 × 75 = 6976. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 52 × 19 = 986. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 638 + 989 = 1627. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 83 × 77 = 6392. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 23 × 47 = 1079. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 13 × 58 = 754. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 43 × 98 = 4219. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 85 × 43 = 3655. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 872 + 927 = 1793. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 37 × 19 = 703. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 848 + 731 = 1579. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 37 × 82 = 3034. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 25 × 76 = 1900. Correct or wrong? (a) wrong (b) correct

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