Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 353 · 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: 74 × 68 = 5032. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 688 + 605 = 1293. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 33 × 71 = 2342. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 958 + 860 = 1818. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 484 + 871 = 1355. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 86 × 16 = 1376. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 385 + 405 = 790. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 85 × 18 = 1536. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 47 × 98 = 4605. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 25 × 60 = 1505. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 33 × 43 = 1421. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 73 × 15 = 1095. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 30 × 30 = 900. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 92 × 59 = 5422. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 29 × 34 = 986. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 839 + 708 = 1547. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 182 + 249 = 431. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 684 + 379 = 1063. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 671 + 207 = 878. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 59 × 58 = 3422. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 53 × 20 = 1060. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 52 × 98 = 5096. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 953 + 933 = 1886. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 845 + 929 = 1774. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 67 × 58 = 3886. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 94 × 72 = 6768. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 45 × 67 = 3012. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 29 × 15 = 427. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 848 + 800 = 1651. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 228 + 179 = 401. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 85 × 29 = 2465. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 78 × 80 = 6240. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 82 × 79 = 6478. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 31 × 92 = 2852. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 741 + 454 = 1195. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 130 + 435 = 564. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 33 × 93 = 3063. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 796 + 914 = 1710. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 952 + 443 = 1394. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 826 + 321 = 1151. Correct or wrong? (a) wrong (b) correct

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