Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 289 · 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: 700 + 933 = 1633. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 161 + 183 = 344. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 56 × 29 = 1631. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 98 × 98 = 9601. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 877 + 839 = 1716. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 943 + 270 = 1213. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 552 + 295 = 847. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 359 + 332 = 689. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 74 × 61 = 4521. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 27 × 78 = 2099. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 379 + 607 = 985. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 353 + 655 = 1008. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 561 + 387 = 948. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 52 × 14 = 724. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 151 + 490 = 641. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 77 × 94 = 7238. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 22 × 90 = 1980. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 805 + 164 = 976. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 880 + 997 = 1881. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 15 × 51 = 765. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 86 × 26 = 2236. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 27 × 66 = 1782. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 13 × 58 = 757. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 122 + 821 = 943. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 75 × 31 = 2330. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 383 + 275 = 658. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 50 × 14 = 700. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 89 × 31 = 2759. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 179 + 811 = 996. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 699 + 503 = 1202. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 887 + 956 = 1843. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 51 × 31 = 1587. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 80 × 73 = 5838. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 90 × 47 = 4230. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 66 × 95 = 6276. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 82 × 28 = 2296. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 80 × 27 = 2152. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 720 + 523 = 1243. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 76 × 59 = 4484. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 366 + 309 = 669. Correct or wrong? (a) correct (b) wrong

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