Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 195 · 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: 368 + 991 = 1351. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 55 × 93 = 5115. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 583 + 399 = 982. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 71 × 68 = 4820. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 58 × 92 = 5336. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 341 + 668 = 1002. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 996 + 149 = 1145. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 284 + 182 = 466. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 23 × 92 = 2116. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 58 × 85 = 4929. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 564 + 981 = 1544. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 28 × 57 = 1596. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 476 + 229 = 705. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 695 + 396 = 1091. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 42 × 55 = 2310. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 133 + 595 = 728. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 457 + 528 = 985. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 535 + 273 = 808. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 65 × 56 = 3640. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 97 × 27 = 2619. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 672 + 418 = 1090. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 870 + 491 = 1361. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 695 + 383 = 1077. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 14 × 74 = 1041. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 40 × 41 = 1640. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 63 × 35 = 2213. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 68 × 16 = 1087. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 935 + 194 = 1129. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 57 × 77 = 4389. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 824 + 161 = 979. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 56 × 86 = 4809. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 76 × 85 = 6460. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 559 + 188 = 747. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 36 × 76 = 2744. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 18 × 37 = 666. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 47 × 17 = 799. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 22 × 91 = 2002. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 833 + 641 = 1479. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 690 + 862 = 1552. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 40 × 88 = 3520. Correct or wrong? (a) wrong (b) correct

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