Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 830 · 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: 45 × 32 = 1440. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 218 + 173 = 391. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 56 × 65 = 3640. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 166 + 174 = 340. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 188 + 849 = 1040. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 56 × 76 = 4256. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 53 × 96 = 5088. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 96 × 27 = 2587. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 553 + 201 = 754. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 478 + 552 = 1033. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 29 × 60 = 1733. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 27 × 62 = 1674. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 949 + 989 = 1931. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 47 × 34 = 1598. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 914 + 358 = 1272. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 86 × 23 = 1978. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 56 × 75 = 4203. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 94 × 23 = 2158. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 625 + 892 = 1523. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 41 × 91 = 3734. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 139 + 210 = 354. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 77 × 57 = 4389. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 853 + 930 = 1790. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 493 + 806 = 1305. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 40 × 85 = 3403. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 78 × 86 = 6708. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 305 + 438 = 745. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 289 + 230 = 521. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 49 × 23 = 1127. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 24 × 28 = 672. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 13 × 79 = 1025. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 96 × 59 = 5665. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 864 + 692 = 1563. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 44 × 51 = 2244. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 453 + 560 = 1019. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 875 + 534 = 1409. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 99 × 73 = 7234. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 91 × 65 = 5918. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 80 × 92 = 7360. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 80 × 86 = 6880. Correct or wrong? (a) wrong (b) correct

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