Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 742 · 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: 808 + 550 = 1358. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 23 × 44 = 1012. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 223 + 893 = 1116. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 865 + 555 = 1421. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 39 × 29 = 1131. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 265 + 770 = 1028. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 50 × 17 = 844. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 53 × 46 = 2439. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 66 × 81 = 5346. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 870 + 811 = 1675. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 16 × 22 = 351. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 88 × 83 = 7311. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 55 × 13 = 715. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 58 × 89 = 5162. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 836 + 557 = 1393. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 67 × 92 = 6163. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 98 × 99 = 9708. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 300 + 387 = 687. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 36 × 49 = 1766. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 15 × 65 = 975. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 834 + 755 = 1589. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 409 + 448 = 853. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 26 × 34 = 876. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 95 × 72 = 6833. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 243 + 174 = 417. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 64 × 54 = 3456. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 128 + 367 = 495. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 755 + 262 = 1017. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 976 + 489 = 1469. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 537 + 975 = 1512. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 70 × 26 = 1828. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 56 × 32 = 1792. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 790 + 801 = 1591. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 60 × 77 = 4620. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 598 + 548 = 1146. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 48 × 81 = 3888. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 525 + 154 = 676. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 87 × 58 = 5046. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 73 × 67 = 4892. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 48 × 28 = 1344. Correct or wrong? (a) wrong (b) correct

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