Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 819 · 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: 437 + 679 = 1111. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 16 × 45 = 723. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 306 + 718 = 1017. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 81 × 15 = 1215. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 36 × 43 = 1548. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 189 + 965 = 1154. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 262 + 126 = 391. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 36 × 67 = 2412. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 766 + 675 = 1443. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 51 × 50 = 2548. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 190 + 389 = 579. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 53 × 92 = 4876. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 80 × 97 = 7760. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 61 × 41 = 2502. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 216 + 534 = 750. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 90 × 81 = 7290. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 74 × 23 = 1702. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 14 × 37 = 522. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 55 × 88 = 4840. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 470 + 841 = 1311. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 585 + 204 = 789. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 257 + 780 = 1032. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 170 + 809 = 979. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 800 + 403 = 1203. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 243 + 903 = 1148. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 323 + 701 = 1024. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 263 + 265 = 524. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 50 × 85 = 4248. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 897 + 478 = 1380. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 155 + 420 = 577. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 539 + 565 = 1102. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 99 × 92 = 9108. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 20 × 29 = 580. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 99 × 46 = 4554. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 438 + 607 = 1047. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 592 + 514 = 1106. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 388 + 238 = 625. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 512 + 120 = 632. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 61 × 14 = 854. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 45 × 78 = 3507. Correct or wrong? (a) correct (b) wrong

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