Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 365 · 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: 29 × 25 = 717. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 17 × 23 = 391. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 997 + 582 = 1579. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 406 + 669 = 1075. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 37 × 63 = 2323. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 664 + 378 = 1042. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 621 + 525 = 1146. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 13 × 31 = 403. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 687 + 292 = 979. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 322 + 475 = 796. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 21 × 42 = 876. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 868 + 604 = 1464. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 244 + 146 = 390. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 704 + 212 = 910. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 377 + 507 = 879. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 35 × 12 = 420. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 619 + 627 = 1246. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 30 × 97 = 2903. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 123 + 125 = 246. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 16 × 68 = 1088. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 21 × 32 = 672. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 73 × 26 = 1898. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 228 + 623 = 854. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 898 + 499 = 1397. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 674 + 490 = 1166. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 621 + 924 = 1546. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 254 + 453 = 707. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 789 + 619 = 1408. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 185 + 651 = 836. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 32 × 91 = 2912. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 12 × 63 = 754. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 22 × 21 = 462. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 441 + 281 = 722. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 27 × 46 = 1242. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 49 × 28 = 1372. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 655 + 133 = 789. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 376 + 813 = 1195. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 57 × 48 = 2736. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 643 + 290 = 941. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 786 + 905 = 1696. Correct or wrong? (a) wrong (b) correct

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