Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 649 · 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: 69 × 74 = 5107. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 65 × 28 = 1812. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 53 × 39 = 2062. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 765 + 980 = 1751. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 997 + 717 = 1722. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 120 + 681 = 801. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 576 + 619 = 1195. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 36 × 61 = 2202. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 14 × 35 = 488. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 39 × 62 = 2421. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 21 × 21 = 445. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 976 + 478 = 1454. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 56 × 89 = 4988. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 35 × 76 = 2660. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 896 + 924 = 1820. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 81 × 84 = 6804. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 99 × 91 = 9007. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 523 + 663 = 1191. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 524 + 553 = 1081. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 263 + 189 = 452. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 73 × 58 = 4230. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 23 × 78 = 1794. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 41 × 57 = 2329. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 264 + 790 = 1056. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 15 × 59 = 885. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 46 × 53 = 2438. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 22 × 23 = 508. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 244 + 913 = 1157. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 248 + 154 = 402. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 189 + 231 = 418. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 63 × 12 = 764. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 961 + 326 = 1287. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 60 × 12 = 720. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 773 + 537 = 1308. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 52 × 26 = 1355. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 777 + 657 = 1434. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 329 + 155 = 484. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 777 + 559 = 1336. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 676 + 287 = 957. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 52 × 35 = 1815. Correct or wrong? (a) wrong (b) correct

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