Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 759 · 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: 67 × 55 = 3684. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 280 + 201 = 481. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 710 + 135 = 844. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 68 × 76 = 5168. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 317 + 453 = 770. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 29 × 87 = 2526. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 63 × 80 = 5040. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 82 × 45 = 3685. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 58 × 73 = 4234. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 553 + 198 = 751. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 404 + 369 = 780. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 25 × 96 = 2400. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 92 × 52 = 4784. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 50 × 13 = 650. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 32 × 61 = 1953. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 24 × 36 = 864. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 597 + 902 = 1499. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 32 × 59 = 1896. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 99 × 76 = 7525. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 50 × 21 = 1055. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 89 × 76 = 6765. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 189 + 138 = 329. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 67 × 49 = 3283. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 72 × 55 = 3955. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 614 + 482 = 1096. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 33 × 17 = 561. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 24 × 49 = 1176. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 13 × 23 = 299. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 598 + 670 = 1268. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 13 × 72 = 936. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 37 × 56 = 2072. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 962 + 243 = 1202. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 47 × 85 = 3995. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 198 + 308 = 506. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 78 × 23 = 1792. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 125 + 928 = 1053. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 848 + 159 = 1005. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 96 × 56 = 5376. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 764 + 558 = 1322. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 283 + 351 = 634. Correct or wrong? (a) correct (b) wrong

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