Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 798 · 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: 15 × 34 = 511. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 22 × 83 = 1824. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 31 × 27 = 840. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 68 × 23 = 1566. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 77 × 79 = 6083. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 650 + 316 = 966. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 17 × 57 = 965. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 402 + 742 = 1144. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 159 + 595 = 759. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 17 × 96 = 1631. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 72 × 16 = 1152. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 82 × 34 = 2788. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 72 × 85 = 6120. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 247 + 622 = 869. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 849 + 533 = 1390. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 22 × 98 = 2163. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 48 × 38 = 1824. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 43 × 88 = 3784. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 145 + 771 = 916. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 79 × 58 = 4582. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 69 × 14 = 966. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 537 + 977 = 1514. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 27 × 57 = 1539. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 65 × 40 = 2605. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 15 × 83 = 1245. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 293 + 298 = 594. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 28 × 97 = 2719. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 992 + 685 = 1677. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 32 × 17 = 551. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 82 × 15 = 1230. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 85 × 12 = 1020. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 70 × 49 = 3434. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 65 × 53 = 3440. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 481 + 591 = 1072. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 707 + 759 = 1466. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 25 × 14 = 356. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 681 + 741 = 1427. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 155 + 946 = 1101. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 320 + 783 = 1106. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 81 × 76 = 6156. Correct or wrong? (a) wrong (b) correct

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