Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 971 · 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 × 48 = 3166. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 39 × 84 = 3280. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 609 + 671 = 1280. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 404 + 309 = 721. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 873 + 816 = 1689. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 29 × 44 = 1276. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 67 × 89 = 5963. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 444 + 418 = 862. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 46 × 81 = 3724. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 57 × 41 = 2337. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 862 + 812 = 1674. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 65 × 61 = 3968. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 774 + 317 = 1091. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 17 × 21 = 357. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 543 + 904 = 1447. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 753 + 649 = 1402. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 71 × 18 = 1283. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 97 × 39 = 3791. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 53 × 46 = 2437. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 272 + 875 = 1142. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 910 + 738 = 1648. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 409 + 607 = 1018. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 325 + 251 = 577. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 97 × 78 = 7566. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 74 × 23 = 1700. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 794 + 199 = 989. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 26 × 81 = 2103. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 798 + 367 = 1167. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 807 + 494 = 1305. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 91 × 19 = 1729. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 967 + 964 = 1933. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 71 × 34 = 2417. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 74 × 70 = 5180. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 25 × 87 = 2175. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 537 + 827 = 1364. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 390 + 496 = 886. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 42 × 42 = 1767. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 14 × 56 = 784. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 23 × 28 = 644. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 94 × 42 = 3948. Correct or wrong? (a) wrong (b) correct

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