Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 642 · 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: 60 × 17 = 1020. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 83 × 16 = 1335. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 57 × 36 = 2052. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 92 × 57 = 5244. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 62 × 67 = 4154. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 469 + 984 = 1459. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 205 + 614 = 819. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 168 + 582 = 750. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 46 × 20 = 924. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 48 × 12 = 583. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 174 + 785 = 965. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 94 × 74 = 6958. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 31 × 28 = 868. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 74 × 14 = 1028. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 84 × 69 = 5801. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 59 × 92 = 5431. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 632 + 822 = 1456. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 45 × 86 = 3870. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 95 × 49 = 4661. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 232 + 236 = 473. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 51 × 14 = 714. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 782 + 939 = 1728. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 74 × 47 = 3482. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 64 × 92 = 5888. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 66 × 69 = 4554. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 28 × 80 = 2243. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 23 × 45 = 1035. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 818 + 240 = 1058. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 66 × 86 = 5676. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 147 + 821 = 968. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 74 × 99 = 7326. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 545 + 506 = 1046. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 763 + 991 = 1754. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 233 + 146 = 377. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 687 + 318 = 1005. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 69 × 70 = 4830. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 578 + 782 = 1360. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 313 + 728 = 1041. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 737 + 816 = 1558. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 830 + 678 = 1508. Correct or wrong? (a) wrong (b) correct

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