Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 175 · 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: 179 + 157 = 339. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 406 + 156 = 562. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 77 × 97 = 7468. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 332 + 635 = 961. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 77 × 56 = 4314. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 853 + 548 = 1403. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 838 + 290 = 1128. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 26 × 17 = 448. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 619 + 808 = 1427. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 73 × 13 = 951. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 13 × 57 = 740. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 33 × 45 = 1485. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 12 × 97 = 1164. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 93 × 72 = 6698. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 501 + 865 = 1366. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 27 × 50 = 1350. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 27 × 94 = 2538. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 275 + 600 = 875. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 13 × 55 = 715. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 370 + 924 = 1292. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 671 + 532 = 1211. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 25 × 19 = 475. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 57 × 94 = 5352. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 844 + 494 = 1338. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 982 + 726 = 1708. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 39 × 49 = 1911. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 915 + 638 = 1558. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 28 × 20 = 560. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 26 × 14 = 364. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 35 × 62 = 2170. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 37 × 74 = 2738. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 74 × 19 = 1398. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 696 + 134 = 830. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 19 × 37 = 700. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 155 + 306 = 461. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 64 × 87 = 5568. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 26 × 45 = 1165. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 92 × 30 = 2753. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 25 × 65 = 1629. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 79 × 31 = 2448. Correct or wrong? (a) wrong (b) correct

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