Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 148 · 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: 682 + 225 = 904. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 927 + 747 = 1674. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 838 + 821 = 1659. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 96 × 36 = 3456. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 312 + 276 = 588. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 28 × 22 = 617. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 30 × 35 = 1049. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 92 × 17 = 1564. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 25 × 29 = 725. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 13 × 31 = 403. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 40 × 25 = 999. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 19 × 90 = 1716. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 97 × 37 = 3589. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 469 + 636 = 1105. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 47 × 68 = 3191. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 17 × 21 = 361. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 93 × 52 = 4836. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 349 + 735 = 1078. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 42 × 97 = 4074. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 795 + 984 = 1779. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 797 + 913 = 1704. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 454 + 880 = 1339. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 805 + 195 = 998. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 824 + 696 = 1521. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 43 × 15 = 645. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 150 + 606 = 756. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 95 × 67 = 6362. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 426 + 673 = 1099. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 689 + 779 = 1470. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 17 × 15 = 260. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 32 × 23 = 737. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 33 × 84 = 2772. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 22 × 34 = 756. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 69 × 34 = 2348. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 74 × 84 = 6216. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 63 × 86 = 5418. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 228 + 527 = 755. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 24 × 65 = 1560. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 92 × 37 = 3404. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 53 × 58 = 3074. Correct or wrong? (a) correct (b) wrong

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