Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 696 · 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: 489 + 961 = 1450. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 79 × 87 = 6873. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 88 × 50 = 4400. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 18 × 84 = 1518. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 62 × 47 = 2914. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 36 × 38 = 1374. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 46 × 48 = 2210. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 22 × 97 = 2140. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 26 × 22 = 572. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 949 + 433 = 1383. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 607 + 631 = 1238. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 435 + 231 = 666. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 12 × 86 = 1028. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 891 + 939 = 1836. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 32 × 95 = 3040. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 49 × 46 = 2251. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 775 + 393 = 1168. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 12 × 73 = 871. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 71 × 20 = 1412. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 242 + 409 = 659. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 59 × 38 = 2242. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 24 × 59 = 1410. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 12 × 46 = 552. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 441 + 745 = 1186. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 843 + 202 = 1045. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 503 + 135 = 646. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 946 + 464 = 1410. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 20 × 71 = 1423. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 448 + 319 = 767. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 776 + 406 = 1183. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 35 × 85 = 2977. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 89 × 34 = 3025. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 399 + 726 = 1118. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 307 + 189 = 490. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 27 × 36 = 976. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 968 + 194 = 1162. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 254 + 418 = 678. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 66 × 37 = 2442. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 91 × 37 = 3362. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 557 + 379 = 935. Correct or wrong? (a) wrong (b) correct

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