Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 655 · 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: 285 + 196 = 481. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 549 + 186 = 730. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 74 × 69 = 5102. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 838 + 585 = 1429. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 16 × 61 = 976. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 887 + 555 = 1434. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 25 × 21 = 525. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 90 × 61 = 5490. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 199 + 829 = 1025. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 34 × 58 = 1976. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 43 × 90 = 3870. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 49 × 87 = 4264. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 34 × 89 = 3029. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 68 × 94 = 6389. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 860 + 362 = 1222. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 715 + 745 = 1453. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 637 + 257 = 894. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 990 + 677 = 1659. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 28 × 77 = 2156. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 516 + 671 = 1189. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 17 × 88 = 1496. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 12 × 34 = 408. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 688 + 654 = 1348. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 195 + 816 = 1011. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 681 + 982 = 1663. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 98 × 89 = 8727. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 434 + 566 = 1002. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 77 × 31 = 2395. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 70 × 82 = 5740. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 789 + 783 = 1568. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 99 × 28 = 2773. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 593 + 120 = 715. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 45 × 34 = 1522. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 58 × 44 = 2552. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 67 × 74 = 4954. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 879 + 513 = 1399. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 73 × 41 = 2998. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 84 × 55 = 4620. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 97 × 97 = 9409. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 176 + 767 = 947. Correct or wrong? (a) correct (b) wrong

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