Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 493 · 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: 16 × 57 = 920. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 96 × 44 = 4223. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 41 × 96 = 3936. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 62 × 49 = 3033. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 99 × 59 = 5841. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 223 + 604 = 827. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 844 + 653 = 1497. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 17 × 82 = 1394. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 291 + 149 = 447. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 770 + 728 = 1498. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 87 × 17 = 1479. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 36 × 93 = 3348. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 845 + 362 = 1207. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 714 + 365 = 1079. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 319 + 184 = 510. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 14 × 95 = 1330. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 34 × 19 = 650. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 77 × 86 = 6622. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 96 × 51 = 4899. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 16 × 98 = 1574. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 460 + 223 = 683. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 573 + 162 = 733. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 583 + 272 = 855. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 63 × 41 = 2583. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 19 × 31 = 589. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 60 × 73 = 4388. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 484 + 484 = 968. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 36 × 40 = 1440. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 23 × 90 = 2070. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 81 × 84 = 6804. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 605 + 199 = 799. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 50 × 13 = 650. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 981 + 874 = 1848. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 52 × 24 = 1251. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 477 + 391 = 874. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 96 × 95 = 9112. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 886 + 232 = 1123. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 557 + 659 = 1217. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 645 + 935 = 1577. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 891 + 475 = 1364. Correct or wrong? (a) wrong (b) correct

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