Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 116 · 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: 46 × 33 = 1518. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 94 × 17 = 1598. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 65 × 18 = 1170. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 70 × 55 = 3850. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 24 × 98 = 2346. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 14 × 86 = 1205. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 42 × 66 = 2765. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 718 + 398 = 1116. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 804 + 398 = 1202. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 948 + 470 = 1418. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 14 × 18 = 252. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 34 × 90 = 3060. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 27 × 94 = 2538. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 69 × 42 = 2903. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 50 × 71 = 3550. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 34 × 40 = 1357. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 83 × 89 = 7382. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 704 + 756 = 1465. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 68 × 74 = 5032. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 35 × 46 = 1614. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 337 + 993 = 1330. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 141 + 381 = 522. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 408 + 867 = 1275. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 544 + 911 = 1450. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 962 + 122 = 1084. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 37 × 33 = 1219. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 79 × 33 = 2607. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 54 × 58 = 3132. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 51 × 74 = 3774. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 559 + 714 = 1271. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 513 + 502 = 1015. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 23 × 79 = 1825. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 515 + 360 = 875. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 15 × 71 = 1065. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 83 × 31 = 2576. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 351 + 551 = 902. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 939 + 253 = 1192. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 176 + 557 = 726. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 265 + 726 = 991. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 93 × 75 = 6976. Correct or wrong? (a) correct (b) wrong

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