Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 375 · 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: 66 × 20 = 1320. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 366 + 963 = 1329. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 98 × 87 = 8521. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 290 + 506 = 797. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 40 × 53 = 2120. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 29 × 92 = 2672. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 61 × 58 = 3538. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 78 × 26 = 2028. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 479 + 748 = 1224. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 329 + 520 = 849. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 19 × 16 = 304. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 95 × 21 = 1996. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 71 × 36 = 2556. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 62 × 66 = 4090. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 66 × 76 = 5017. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 29 × 44 = 1280. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 235 + 489 = 724. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 95 × 42 = 3990. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 42 × 61 = 2569. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 907 + 492 = 1399. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 737 + 237 = 974. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 71 × 71 = 5041. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 628 + 309 = 936. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 59 × 28 = 1652. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 647 + 377 = 1024. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 376 + 158 = 540. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 837 + 138 = 975. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 43 × 27 = 1161. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 992 + 383 = 1375. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 16 × 37 = 592. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 60 × 31 = 1860. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 604 + 605 = 1209. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 304 + 889 = 1201. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 25 × 96 = 2407. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 42 × 50 = 2100. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 58 × 61 = 3538. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 549 + 619 = 1168. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 568 + 442 = 1012. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 32 × 23 = 736. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 63 × 42 = 2644. Correct or wrong? (a) wrong (b) correct

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