Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 539 · 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: 75 × 70 = 5250. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 469 + 638 = 1107. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 252 + 375 = 619. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 16 × 42 = 672. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 98 × 53 = 5194. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 16 × 32 = 512. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 99 × 71 = 7029. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 40 × 95 = 3796. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 63 × 97 = 6115. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 77 × 46 = 3536. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 42 × 19 = 799. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 872 + 139 = 1011. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 78 × 14 = 1094. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 832 + 976 = 1808. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 85 × 35 = 2968. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 565 + 800 = 1361. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 25 × 77 = 1925. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 280 + 314 = 600. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 697 + 887 = 1592. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 81 × 41 = 3321. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 76 × 21 = 1596. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 912 + 795 = 1715. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 665 + 659 = 1330. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 65 × 95 = 6175. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 679 + 463 = 1142. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 593 + 817 = 1410. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 971 + 694 = 1665. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 95 × 25 = 2375. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 56 × 32 = 1791. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 551 + 618 = 1169. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 897 + 521 = 1418. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 22 × 27 = 600. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 16 × 41 = 656. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 15 × 93 = 1403. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 650 + 950 = 1600. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 910 + 304 = 1214. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 18 × 37 = 666. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 235 + 540 = 775. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 69 × 75 = 5175. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 700 + 564 = 1264. Correct or wrong? (a) wrong (b) correct

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