Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 25 · 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: 172 + 336 = 508. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 91 × 43 = 3916. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 59 × 27 = 1598. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 30 × 39 = 1172. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 52 × 64 = 3330. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 282 + 332 = 610. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 529 + 273 = 796. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 15 × 39 = 579. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 83 × 93 = 7711. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 27 × 36 = 972. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 27 × 91 = 2453. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 37 × 72 = 2663. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 66 × 68 = 4484. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 885 + 513 = 1398. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 30 × 52 = 1557. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 75 × 59 = 4425. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 38 × 15 = 568. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 83 × 18 = 1495. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 23 × 94 = 2162. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 35 × 87 = 3045. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 97 × 18 = 1739. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 915 + 493 = 1408. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 67 × 22 = 1473. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 28 × 16 = 448. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 242 + 203 = 443. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 517 + 808 = 1326. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 92 × 62 = 5712. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 506 + 348 = 854. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 46 × 88 = 4053. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 43 × 31 = 1333. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 83 × 30 = 2498. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 73 × 68 = 4964. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 71 × 75 = 5325. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 85 × 49 = 4169. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 545 + 163 = 708. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 41 × 96 = 3936. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 35 × 47 = 1645. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 470 + 821 = 1292. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 96 × 20 = 1923. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 78 × 24 = 1872. Correct or wrong? (a) wrong (b) correct

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