Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 975 · 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: 135 + 368 = 503. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 796 + 756 = 1552. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 47 × 59 = 2777. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 20 × 62 = 1240. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 21 × 75 = 1575. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 90 × 63 = 5663. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 365 + 331 = 696. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 38 × 15 = 570. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 323 + 759 = 1079. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 637 + 976 = 1616. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 73 × 59 = 4307. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 83 × 66 = 5478. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 86 × 87 = 7482. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 320 + 306 = 633. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 20 × 33 = 660. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 19 × 72 = 1368. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 14 × 62 = 868. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 36 × 82 = 2948. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 206 + 527 = 738. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 96 × 77 = 7394. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 84 × 47 = 3940. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 50 × 44 = 2196. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 17 × 31 = 530. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 36 × 76 = 2736. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 25 × 19 = 481. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 358 + 805 = 1171. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 689 + 403 = 1092. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 86 × 68 = 5848. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 40 × 43 = 1718. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 38 × 66 = 2509. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 42 × 69 = 2906. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 23 × 63 = 1449. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 89 × 83 = 7387. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 324 + 329 = 653. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 334 + 846 = 1185. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 17 × 27 = 459. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 98 × 54 = 5292. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 93 × 41 = 3813. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 70 × 34 = 2380. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 322 + 571 = 893. Correct or wrong? (a) correct (b) wrong

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