Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 978 · 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: 75 × 30 = 2250. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 222 + 315 = 537. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 84 × 79 = 6639. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 30 × 31 = 930. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 482 + 182 = 664. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 96 × 97 = 9312. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 19 × 53 = 1007. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 167 + 866 = 1039. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 812 + 442 = 1259. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 347 + 443 = 790. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 258 + 855 = 1113. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 23 × 79 = 1817. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 640 + 663 = 1303. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 855 + 834 = 1687. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 264 + 791 = 1047. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 89 × 76 = 6764. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 476 + 835 = 1311. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 472 + 834 = 1304. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 40 × 34 = 1360. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 73 × 34 = 2474. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 34 × 98 = 3332. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 972 + 522 = 1494. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 419 + 142 = 567. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 624 + 527 = 1150. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 70 × 31 = 2170. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 81 × 79 = 6399. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 750 + 969 = 1719. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 273 + 366 = 639. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 44 × 99 = 4356. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 886 + 131 = 1013. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 677 + 985 = 1662. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 290 + 154 = 437. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 774 + 242 = 1019. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 906 + 858 = 1764. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 21 × 29 = 609. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 14 × 97 = 1358. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 906 + 173 = 1079. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 910 + 679 = 1589. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 94 × 91 = 8553. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 40 × 19 = 760. Correct or wrong? (a) wrong (b) correct

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