Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 633 · 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: 74 × 22 = 1622. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 295 + 684 = 979. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 86 × 82 = 7052. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 580 + 895 = 1469. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 915 + 459 = 1368. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 798 + 561 = 1356. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 90 × 46 = 4140. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 901 + 385 = 1286. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 353 + 500 = 850. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 334 + 467 = 797. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 56 × 60 = 3360. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 16 × 62 = 992. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 57 × 83 = 4737. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 72 × 78 = 5617. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 613 + 893 = 1503. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 86 × 14 = 1205. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 534 + 725 = 1259. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 969 + 362 = 1331. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 12 × 36 = 432. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 24 × 78 = 1872. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 69 × 40 = 2760. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 914 + 485 = 1399. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 59 × 93 = 5487. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 22 × 12 = 262. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 31 × 61 = 1894. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 193 + 204 = 390. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 397 + 907 = 1304. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 28 × 92 = 2577. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 14 × 36 = 504. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 56 × 78 = 4368. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 139 + 662 = 801. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 42 × 49 = 2053. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 58 × 19 = 1102. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 79 × 27 = 2133. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 86 × 84 = 7232. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 129 + 581 = 710. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 924 + 274 = 1201. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 85 × 38 = 3227. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 25 × 34 = 850. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 339 + 340 = 677. Correct or wrong? (a) wrong (b) correct

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