Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 421 · 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: 50 × 35 = 1746. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 90 × 53 = 4770. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 73 × 26 = 1897. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 31 × 42 = 1302. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 52 × 67 = 3484. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 40 × 93 = 3720. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 95 × 41 = 3895. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 14 × 75 = 1050. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 891 + 471 = 1362. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 65 × 40 = 2601. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 729 + 815 = 1544. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 799 + 448 = 1239. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 12 × 82 = 992. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 18 × 85 = 1530. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 486 + 861 = 1353. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 82 × 78 = 6396. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 397 + 171 = 573. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 249 + 308 = 555. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 69 × 25 = 1733. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 823 + 922 = 1737. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 656 + 583 = 1231. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 20 × 81 = 1612. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 358 + 938 = 1289. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 320 + 579 = 899. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 787 + 542 = 1329. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 56 × 79 = 4419. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 815 + 567 = 1382. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 20 × 81 = 1625. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 65 × 70 = 4550. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 580 + 232 = 812. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 95 × 41 = 3895. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 67 × 20 = 1347. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 21 × 27 = 568. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 300 + 431 = 731. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 945 + 413 = 1358. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 65 × 12 = 777. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 66 × 79 = 5214. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 191 + 906 = 1097. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 855 + 825 = 1684. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 74 × 96 = 7105. Correct or wrong? (a) wrong (b) correct

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