Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 891 · 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: 970 + 256 = 1226. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 541 + 724 = 1265. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 17 × 68 = 1163. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 242 + 271 = 509. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 73 × 97 = 7083. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 87 × 99 = 8613. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 20 × 33 = 660. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 55 × 72 = 3960. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 61 × 88 = 5368. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 84 × 36 = 3024. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 873 + 443 = 1316. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 888 + 259 = 1147. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 94 × 39 = 3666. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 52 × 80 = 4160. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 24 × 30 = 720. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 837 + 171 = 1008. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 404 + 374 = 778. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 431 + 305 = 728. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 925 + 650 = 1582. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 79 × 34 = 2688. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 80 × 39 = 3117. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 830 + 479 = 1311. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 319 + 164 = 483. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 45 × 14 = 637. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 836 + 167 = 1003. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 81 × 32 = 2592. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 197 + 344 = 544. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 99 × 24 = 2376. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 61 × 38 = 2310. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 38 × 35 = 1330. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 755 + 276 = 1026. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 622 + 691 = 1316. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 784 + 878 = 1662. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 907 + 365 = 1274. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 52 × 41 = 2135. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 34 × 78 = 2652. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 78 × 30 = 2340. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 21 × 75 = 1575. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 764 + 542 = 1306. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 21 × 84 = 1764. Correct or wrong? (a) correct (b) wrong

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