Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 721 · 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: 68 × 15 = 1020. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 89 × 42 = 3738. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 734 + 714 = 1448. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 995 + 331 = 1329. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 738 + 973 = 1713. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 261 + 281 = 544. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 75 × 49 = 3679. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 53 × 39 = 2071. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 51 × 47 = 2397. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 85 × 93 = 7905. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 65 × 99 = 6435. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 93 × 71 = 6609. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 16 × 34 = 544. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 57 × 54 = 3078. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 706 + 694 = 1401. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 967 + 435 = 1398. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 176 + 450 = 628. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 133 + 388 = 521. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 45 × 30 = 1345. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 19 × 15 = 280. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 59 × 30 = 1770. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 313 + 432 = 745. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 33 × 86 = 2833. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 94 × 49 = 4612. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 131 + 619 = 757. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 325 + 961 = 1286. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 927 + 215 = 1142. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 160 + 700 = 860. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 243 + 903 = 1146. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 80 × 31 = 2480. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 29 × 82 = 2379. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 363 + 464 = 827. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 456 + 829 = 1282. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 122 + 868 = 988. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 636 + 721 = 1357. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 997 + 657 = 1659. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 57 × 88 = 5022. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 476 + 529 = 1003. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 35 × 94 = 3290. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 73 × 91 = 6647. Correct or wrong? (a) wrong (b) correct

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