Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 29 · 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: 79 × 15 = 1185. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 95 × 91 = 8645. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 93 × 68 = 6324. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 717 + 935 = 1648. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 482 + 668 = 1150. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 71 × 63 = 4470. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 97 × 26 = 2521. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 16 × 65 = 1040. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 20 × 96 = 1920. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 84 × 72 = 6048. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 96 × 27 = 2591. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 443 + 833 = 1276. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 40 × 26 = 1040. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 703 + 490 = 1191. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 79 × 41 = 3239. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 85 × 31 = 2635. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 98 × 62 = 6078. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 78 × 54 = 4220. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 265 + 707 = 969. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 13 × 99 = 1285. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 987 + 553 = 1540. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 75 × 55 = 4123. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 539 + 883 = 1422. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 36 × 62 = 2232. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 734 + 814 = 1542. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 57 × 33 = 1880. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 68 × 49 = 3332. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 274 + 849 = 1123. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 53 × 66 = 3498. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 44 × 99 = 4356. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 443 + 779 = 1222. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 65 × 40 = 2603. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 48 × 31 = 1488. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 94 × 27 = 2537. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 694 + 955 = 1649. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 52 × 59 = 3074. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 380 + 121 = 497. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 97 × 41 = 3977. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 457 + 618 = 1075. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 867 + 437 = 1297. Correct or wrong? (a) wrong (b) correct

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