Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 84 · 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: 70 × 16 = 1120. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 65 × 22 = 1435. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 49 × 71 = 3473. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 648 + 306 = 955. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 31 × 29 = 900. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 12 × 21 = 252. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 305 + 253 = 558. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 244 + 197 = 434. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 282 + 236 = 519. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 279 + 409 = 688. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 277 + 327 = 604. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 943 + 944 = 1889. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 58 × 15 = 864. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 752 + 158 = 910. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 39 × 50 = 1943. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 343 + 709 = 1052. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 283 + 937 = 1226. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 79 × 76 = 6004. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 946 + 622 = 1561. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 94 × 40 = 3765. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 93 × 12 = 1122. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 478 + 212 = 683. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 289 + 255 = 544. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 45 × 82 = 3690. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 27 × 56 = 1505. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 909 + 471 = 1383. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 95 × 49 = 4655. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 93 × 91 = 8463. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 862 + 862 = 1724. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 395 + 488 = 880. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 83 × 81 = 6731. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 693 + 412 = 1104. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 137 + 746 = 883. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 29 × 23 = 667. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 22 × 82 = 1804. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 27 × 12 = 324. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 19 × 38 = 722. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 157 + 173 = 330. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 650 + 382 = 1032. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 455 + 222 = 677. Correct or wrong? (a) wrong (b) correct

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