Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 977 · 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: 656 + 977 = 1633. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 36 × 40 = 1440. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 30 × 58 = 1740. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 82 × 66 = 5412. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 737 + 656 = 1399. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 64 × 26 = 1666. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 441 + 360 = 801. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 33 × 62 = 2039. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 686 + 991 = 1677. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 52 × 92 = 4784. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 64 × 82 = 5242. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 986 + 695 = 1674. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 476 + 792 = 1268. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 72 × 55 = 3960. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 39 × 35 = 1365. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 95 × 94 = 8930. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 92 × 41 = 3770. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 258 + 633 = 888. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 49 × 53 = 2597. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 76 × 94 = 7144. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 83 × 20 = 1662. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 22 × 58 = 1272. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 56 × 17 = 960. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 177 + 328 = 512. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 67 × 81 = 5427. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 351 + 294 = 647. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 858 + 279 = 1137. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 695 + 723 = 1415. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 37 × 39 = 1443. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 691 + 310 = 999. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 27 × 36 = 972. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 618 + 241 = 859. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 730 + 259 = 993. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 83 × 47 = 3901. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 500 + 832 = 1332. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 69 × 43 = 2970. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 58 × 60 = 3480. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 84 × 97 = 8144. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 50 × 77 = 3848. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 42 × 12 = 510. Correct or wrong? (a) wrong (b) correct

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