Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 103 · 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: 851 + 357 = 1203. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 15 × 51 = 765. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 499 + 990 = 1481. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 54 × 52 = 2808. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 977 + 588 = 1566. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 23 × 80 = 1848. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 31 × 45 = 1398. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 307 + 409 = 709. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 18 × 85 = 1530. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 45 × 84 = 3780. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 176 + 937 = 1113. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 85 × 81 = 6885. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 713 + 143 = 856. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 487 + 231 = 718. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 177 + 746 = 920. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 21 × 67 = 1415. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 45 × 82 = 3695. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 57 × 51 = 2907. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 880 + 185 = 1065. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 382 + 420 = 801. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 96 × 16 = 1534. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 69 × 27 = 1861. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 32 × 36 = 1152. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 82 × 86 = 7044. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 47 × 86 = 4038. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 68 × 95 = 6460. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 45 × 45 = 2025. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 54 × 85 = 4590. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 56 × 26 = 1456. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 77 × 60 = 4620. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 16 × 34 = 544. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 41 × 14 = 579. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 40 × 79 = 3163. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 865 + 146 = 1004. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 384 + 519 = 903. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 36 × 71 = 2556. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 33 × 68 = 2240. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 83 × 30 = 2490. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 57 × 58 = 3308. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 503 + 860 = 1363. Correct or wrong? (a) wrong (b) correct

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