Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 43 · 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 × 68 = 5100. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 78 × 61 = 4756. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 689 + 986 = 1675. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 24 × 33 = 799. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 26 × 14 = 364. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 67 × 16 = 1065. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 515 + 761 = 1276. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 56 × 39 = 2184. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 694 + 816 = 1510. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 362 + 558 = 913. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 22 × 54 = 1190. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 59 × 94 = 5546. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 43 × 41 = 1763. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 67 × 25 = 1675. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 57 × 30 = 1706. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 61 × 65 = 3957. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 13 × 78 = 1013. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 893 + 135 = 1028. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 756 + 491 = 1247. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 78 × 54 = 4212. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 200 + 434 = 634. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 41 × 98 = 4022. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 537 + 148 = 685. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 92 × 55 = 5053. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 340 + 652 = 991. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 184 + 994 = 1186. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 368 + 467 = 827. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 15 × 28 = 420. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 690 + 604 = 1294. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 779 + 765 = 1550. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 272 + 958 = 1230. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 31 × 67 = 2077. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 43 × 28 = 1204. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 807 + 135 = 942. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 581 + 138 = 719. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 733 + 533 = 1264. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 29 × 92 = 2674. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 364 + 413 = 777. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 799 + 284 = 1088. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 54 × 46 = 2480. Correct or wrong? (a) wrong (b) correct

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