Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 89 · 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: 34 × 95 = 3223. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 71 × 83 = 5893. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 58 × 28 = 1624. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 36 × 59 = 2119. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 93 × 57 = 5303. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 18 × 26 = 468. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 30 × 69 = 2064. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 39 × 18 = 695. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 54 × 27 = 1458. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 35 × 86 = 3010. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 274 + 396 = 671. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 479 + 144 = 625. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 34 × 40 = 1360. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 185 + 893 = 1078. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 73 × 49 = 3573. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 93 × 36 = 3348. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 92 × 31 = 2852. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 143 + 507 = 651. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 19 × 38 = 722. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 159 + 544 = 704. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 28 × 99 = 2771. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 862 + 326 = 1191. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 19 × 93 = 1762. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 596 + 312 = 912. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 83 × 63 = 5229. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 925 + 360 = 1281. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 451 + 478 = 929. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 78 × 62 = 4836. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 42 × 28 = 1176. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 87 × 41 = 3571. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 64 × 77 = 4928. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 839 + 735 = 1572. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 20 × 20 = 400. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 304 + 723 = 1020. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 24 × 79 = 1897. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 12 × 64 = 770. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 48 × 60 = 2884. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 806 + 171 = 972. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 43 × 46 = 1985. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 82 × 73 = 5986. Correct or wrong? (a) correct (b) wrong

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