Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 286 · 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: 81 × 22 = 1788. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 77 × 69 = 5313. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 66 × 65 = 4290. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 728 + 586 = 1314. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 190 + 853 = 1050. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 90 × 37 = 3330. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 140 + 206 = 346. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 60 × 59 = 3548. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 34 × 15 = 510. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 94 × 73 = 6862. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 42 × 82 = 3448. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 44 × 14 = 623. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 87 × 32 = 2791. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 775 + 656 = 1435. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 356 + 359 = 715. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 89 × 41 = 3651. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 200 + 822 = 1022. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 786 + 295 = 1081. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 64 × 88 = 5632. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 94 × 26 = 2444. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 604 + 483 = 1090. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 932 + 888 = 1820. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 477 + 661 = 1138. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 77 × 44 = 3382. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 775 + 250 = 1022. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 910 + 764 = 1674. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 23 × 67 = 1541. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 24 × 32 = 768. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 287 + 261 = 548. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 969 + 562 = 1525. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 268 + 908 = 1172. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 14 × 33 = 462. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 85 × 96 = 8167. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 204 + 803 = 1007. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 654 + 309 = 963. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 442 + 504 = 947. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 87 × 56 = 4879. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 47 × 39 = 1832. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 22 × 67 = 1471. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 654 + 302 = 952. Correct or wrong? (a) correct (b) wrong

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