Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 525 · 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: 61 × 42 = 2563. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 40 × 72 = 2884. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 990 + 634 = 1627. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 97 × 64 = 6200. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 269 + 758 = 1027. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 167 + 933 = 1098. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 507 + 478 = 984. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 135 + 695 = 822. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 993 + 205 = 1198. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 95 × 95 = 9030. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 40 × 23 = 915. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 31 × 48 = 1488. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 70 × 43 = 3009. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 163 + 734 = 897. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 88 × 38 = 3344. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 461 + 783 = 1241. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 133 + 701 = 838. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 165 + 161 = 326. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 195 + 639 = 834. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 69 × 89 = 6141. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 78 × 72 = 5622. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 86 × 99 = 8514. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 968 + 232 = 1200. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 292 + 278 = 571. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 22 × 46 = 1012. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 936 + 738 = 1674. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 26 × 25 = 650. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 24 × 45 = 1072. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 78 × 82 = 6396. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 23 × 24 = 557. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 31 × 20 = 619. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 27 × 32 = 863. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 97 × 72 = 6984. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 38 × 73 = 2775. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 402 + 280 = 682. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 67 × 22 = 1479. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 906 + 637 = 1544. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 77 × 95 = 7323. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 74 × 95 = 7023. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 187 + 460 = 655. Correct or wrong? (a) correct (b) wrong

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