Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 617 · 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: 38 × 33 = 1251. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 171 + 286 = 457. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 316 + 651 = 967. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 82 × 87 = 7131. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 24 × 27 = 648. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 21 × 22 = 462. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 898 + 158 = 1056. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 42 × 47 = 1974. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 75 × 89 = 6669. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 216 + 753 = 975. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 538 + 561 = 1099. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 43 × 35 = 1505. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 212 + 585 = 797. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 668 + 928 = 1596. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 92 × 59 = 5422. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 145 + 527 = 670. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 28 × 70 = 1958. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 280 + 985 = 1265. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 590 + 254 = 844. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 567 + 123 = 698. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 787 + 587 = 1382. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 271 + 484 = 754. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 68 × 98 = 6672. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 87 × 15 = 1305. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 87 × 20 = 1747. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 379 + 497 = 876. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 63 × 49 = 3089. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 950 + 669 = 1619. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 30 × 90 = 2700. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 52 × 74 = 3848. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 583 + 189 = 767. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 40 × 44 = 1760. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 875 + 653 = 1530. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 914 + 274 = 1188. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 336 + 600 = 936. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 332 + 766 = 1101. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 28 × 26 = 730. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 91 × 92 = 8372. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 333 + 520 = 854. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 58 × 82 = 4753. Correct or wrong? (a) wrong (b) correct

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