Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 406 · 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: 24 × 79 = 1897. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 251 + 589 = 840. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 14 × 36 = 508. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 655 + 199 = 857. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 301 + 651 = 957. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 586 + 501 = 1082. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 54 × 97 = 5234. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 90 × 50 = 4500. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 80 × 85 = 6803. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 146 + 927 = 1078. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 137 + 432 = 564. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 829 + 487 = 1319. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 581 + 985 = 1565. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 806 + 247 = 1053. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 311 + 347 = 661. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 34 × 22 = 748. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 704 + 438 = 1137. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 788 + 377 = 1165. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 50 × 51 = 2550. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 23 × 28 = 644. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 54 × 16 = 870. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 13 × 95 = 1230. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 25 × 54 = 1350. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 183 + 372 = 552. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 33 × 65 = 2145. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 13 × 45 = 585. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 83 × 83 = 6889. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 18 × 65 = 1170. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 391 + 516 = 909. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 85 × 95 = 8067. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 257 + 388 = 645. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 46 × 14 = 644. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 18 × 65 = 1169. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 21 × 99 = 2085. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 413 + 868 = 1281. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 19 × 94 = 1786. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 52 × 33 = 1716. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 26 × 17 = 442. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 404 + 605 = 1009. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 756 + 131 = 887. Correct or wrong? (a) wrong (b) correct

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