Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 571 · 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: 98 × 91 = 8918. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 264 + 145 = 407. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 335 + 640 = 975. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 469 + 669 = 1138. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 203 + 992 = 1195. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 582 + 208 = 790. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 65 × 80 = 5193. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 92 × 15 = 1380. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 59 × 82 = 4840. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 652 + 827 = 1479. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 670 + 843 = 1516. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 58 × 43 = 2491. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 986 + 450 = 1436. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 58 × 97 = 5626. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 863 + 314 = 1177. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 96 × 91 = 8735. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 217 + 138 = 355. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 434 + 644 = 1078. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 705 + 137 = 842. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 475 + 561 = 1036. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 348 + 623 = 975. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 456 + 524 = 975. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 90 × 17 = 1530. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 750 + 152 = 907. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 364 + 837 = 1201. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 912 + 817 = 1724. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 22 × 12 = 264. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 29 × 78 = 2262. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 86 × 55 = 4730. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 64 × 32 = 2048. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 90 × 79 = 7110. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 15 × 31 = 465. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 59 × 90 = 5310. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 47 × 19 = 893. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 15 × 61 = 915. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 50 × 92 = 4600. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 886 + 936 = 1822. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 644 + 531 = 1172. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 38 × 84 = 3199. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 141 + 448 = 583. Correct or wrong? (a) wrong (b) correct

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