Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 749 · 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: 290 + 353 = 643. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 95 × 55 = 5225. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 85 × 76 = 6465. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 65 × 54 = 3510. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 45 × 13 = 584. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 97 × 84 = 8146. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 97 × 77 = 7469. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 486 + 734 = 1220. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 338 + 194 = 537. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 94 × 65 = 6102. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 75 × 90 = 6758. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 432 + 680 = 1104. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 33 × 36 = 1181. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 88 × 69 = 6076. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 26 × 28 = 728. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 60 × 37 = 2220. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 524 + 822 = 1346. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 18 × 58 = 1045. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 13 × 86 = 1118. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 834 + 596 = 1429. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 78 × 12 = 936. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 77 × 74 = 5698. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 61 × 66 = 4026. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 136 + 366 = 501. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 434 + 952 = 1394. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 478 + 663 = 1141. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 23 × 71 = 1633. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 618 + 246 = 862. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 17 × 88 = 1496. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 958 + 498 = 1456. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 14 × 66 = 924. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 63 × 37 = 2328. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 97 × 49 = 4758. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 12 × 89 = 1068. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 747 + 945 = 1697. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 237 + 808 = 1047. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 58 × 57 = 3306. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 512 + 794 = 1311. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 22 × 84 = 1848. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 492 + 662 = 1154. Correct or wrong? (a) correct (b) wrong

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