Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 815 · 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: 72 × 51 = 3669. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 897 + 152 = 1041. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 56 × 13 = 723. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 276 + 377 = 653. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 954 + 482 = 1436. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 459 + 247 = 706. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 63 × 49 = 3087. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 764 + 727 = 1498. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 74 × 20 = 1484. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 58 × 39 = 2256. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 21 × 66 = 1384. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 994 + 397 = 1391. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 383 + 310 = 690. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 79 × 65 = 5135. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 903 + 257 = 1160. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 53 × 33 = 1749. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 75 × 73 = 5475. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 379 + 992 = 1371. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 755 + 155 = 910. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 367 + 803 = 1176. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 70 × 15 = 1049. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 473 + 168 = 639. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 33 × 95 = 3135. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 955 + 328 = 1284. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 26 × 18 = 468. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 996 + 561 = 1557. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 869 + 410 = 1283. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 41 × 94 = 3854. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 14 × 99 = 1378. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 47 × 43 = 2021. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 58 × 78 = 4525. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 25 × 65 = 1625. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 93 × 48 = 4458. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 329 + 287 = 617. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 63 × 94 = 5922. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 303 + 276 = 579. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 225 + 322 = 554. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 85 × 95 = 8077. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 474 + 251 = 725. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 89 × 62 = 5526. Correct or wrong? (a) correct (b) wrong

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