Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 832 · 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: 20 × 45 = 899. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 73 × 17 = 1241. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 28 × 82 = 2296. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 31 × 62 = 1928. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 197 + 534 = 724. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 25 × 31 = 775. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 315 + 338 = 653. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 814 + 860 = 1674. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 362 + 464 = 826. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 847 + 587 = 1434. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 81 × 76 = 6152. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 67 × 80 = 5360. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 15 × 54 = 810. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 86 × 45 = 3870. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 719 + 356 = 1075. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 786 + 813 = 1600. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 18 × 29 = 522. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 498 + 930 = 1432. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 655 + 325 = 980. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 62 × 26 = 1612. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 176 + 820 = 996. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 12 × 85 = 1020. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 352 + 777 = 1136. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 19 × 90 = 1710. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 379 + 660 = 1041. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 715 + 823 = 1536. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 629 + 330 = 962. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 18 × 35 = 630. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 555 + 371 = 926. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 120 + 911 = 1031. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 988 + 779 = 1764. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 369 + 549 = 918. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 312 + 184 = 496. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 49 × 45 = 2205. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 42 × 23 = 973. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 830 + 788 = 1623. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 521 + 568 = 1094. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 54 × 25 = 1346. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 92 × 86 = 7912. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 25 × 14 = 350. Correct or wrong? (a) correct (b) wrong

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