Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 503 · 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: 759 + 651 = 1410. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 75 × 27 = 2024. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 442 + 325 = 765. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 914 + 280 = 1195. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 56 × 17 = 956. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 825 + 894 = 1719. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 395 + 759 = 1161. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 17 × 12 = 210. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 36 × 71 = 2556. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 54 × 61 = 3294. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 748 + 809 = 1557. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 57 × 70 = 3985. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 53 × 99 = 5247. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 82 × 94 = 7708. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 593 + 727 = 1313. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 51 × 40 = 2040. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 14 × 82 = 1148. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 354 + 256 = 610. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 85 × 56 = 4760. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 68 × 31 = 2108. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 48 × 19 = 916. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 866 + 924 = 1783. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 56 × 25 = 1398. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 980 + 381 = 1357. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 281 + 896 = 1177. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 76 × 62 = 4712. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 75 × 19 = 1425. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 955 + 420 = 1375. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 78 × 92 = 7176. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 260 + 704 = 964. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 68 × 21 = 1428. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 582 + 190 = 772. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 17 × 95 = 1608. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 27 × 73 = 1973. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 61 × 64 = 3904. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 298 + 992 = 1289. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 38 × 33 = 1254. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 27 × 14 = 382. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 389 + 412 = 803. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 343 + 256 = 605. Correct or wrong? (a) correct (b) wrong

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