Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 604 · 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: 91 × 21 = 1911. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 69 × 14 = 967. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 724 + 931 = 1655. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 868 + 596 = 1464. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 44 × 14 = 616. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 333 + 793 = 1126. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 775 + 141 = 918. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 45 × 73 = 3285. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 205 + 264 = 472. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 134 + 638 = 772. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 995 + 488 = 1483. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 480 + 435 = 919. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 906 + 136 = 1039. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 43 × 15 = 640. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 843 + 687 = 1538. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 567 + 981 = 1548. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 13 × 23 = 297. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 15 × 26 = 390. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 324 + 789 = 1113. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 363 + 944 = 1309. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 788 + 590 = 1375. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 284 + 167 = 448. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 92 × 35 = 3220. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 141 + 277 = 416. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 571 + 316 = 892. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 330 + 322 = 652. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 939 + 123 = 1064. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 925 + 533 = 1464. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 21 × 12 = 259. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 441 + 174 = 615. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 245 + 961 = 1206. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 68 × 65 = 4420. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 538 + 299 = 837. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 81 × 92 = 7452. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 78 × 56 = 4368. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 84 × 22 = 1848. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 244 + 669 = 913. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 72 × 24 = 1730. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 36 × 16 = 576. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 70 × 64 = 4473. Correct or wrong? (a) wrong (b) correct

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