Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 986 · 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: 18 × 52 = 936. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 82 × 30 = 2460. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 50 × 19 = 950. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 32 × 12 = 384. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 81 × 93 = 7535. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 57 × 73 = 4161. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 17 × 44 = 748. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 54 × 12 = 648. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 793 + 178 = 971. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 35 × 26 = 914. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 45 × 24 = 1080. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 71 × 40 = 2840. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 318 + 825 = 1138. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 829 + 794 = 1623. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 995 + 944 = 1939. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 31 × 82 = 2546. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 696 + 764 = 1460. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 12 × 55 = 667. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 87 × 41 = 3567. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 17 × 30 = 510. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 750 + 286 = 1036. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 84 × 57 = 4788. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 97 × 25 = 2433. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 167 + 221 = 390. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 16 × 29 = 465. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 87 × 19 = 1653. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 50 × 36 = 1804. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 47 × 81 = 3799. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 56 × 79 = 4426. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 75 × 13 = 971. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 463 + 650 = 1114. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 98 × 46 = 4508. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 73 × 28 = 2037. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 85 × 32 = 2720. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 80 × 29 = 2320. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 96 × 64 = 6144. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 20 × 98 = 1959. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 55 × 49 = 2687. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 565 + 794 = 1361. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 900 + 785 = 1685. Correct or wrong? (a) correct (b) wrong

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