Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 147 · 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: 92 × 79 = 7268. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 934 + 375 = 1308. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 75 × 31 = 2325. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 41 × 19 = 787. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 72 × 22 = 1584. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 912 + 137 = 1049. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 344 + 494 = 838. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 206 + 820 = 1028. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 129 + 727 = 850. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 20 × 23 = 460. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 36 × 18 = 651. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 25 × 19 = 475. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 922 + 628 = 1554. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 97 × 69 = 6693. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 90 × 13 = 1170. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 54 × 88 = 4752. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 97 × 86 = 8342. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 353 + 570 = 923. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 24 × 47 = 1128. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 25 × 62 = 1550. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 302 + 300 = 599. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 979 + 848 = 1827. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 53 × 28 = 1484. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 609 + 847 = 1453. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 81 × 41 = 3321. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 48 × 67 = 3216. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 61 × 13 = 800. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 434 + 197 = 631. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 85 × 95 = 8075. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 195 + 603 = 790. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 98 × 97 = 9506. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 27 × 38 = 1026. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 93 × 88 = 8184. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 517 + 558 = 1078. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 626 + 640 = 1266. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 374 + 672 = 1045. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 60 × 80 = 4808. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 61 × 46 = 2806. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 295 + 287 = 582. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 152 + 216 = 361. Correct or wrong? (a) correct (b) wrong

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