Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 914 · 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: 68 × 28 = 1905. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 214 + 663 = 875. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 955 + 794 = 1745. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 710 + 401 = 1111. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 35 × 49 = 1715. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 85 × 66 = 5602. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 35 × 32 = 1119. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 56 × 88 = 4927. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 483 + 903 = 1386. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 471 + 645 = 1112. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 34 × 50 = 1700. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 612 + 297 = 909. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 71 × 21 = 1491. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 23 × 27 = 619. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 157 + 130 = 287. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 675 + 699 = 1368. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 81 × 55 = 4455. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 91 × 25 = 2271. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 68 × 52 = 3536. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 132 + 923 = 1058. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 421 + 248 = 677. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 449 + 165 = 617. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 14 × 87 = 1222. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 34 × 60 = 2033. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 72 × 39 = 2808. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 310 + 397 = 710. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 84 × 76 = 6384. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 15 × 76 = 1140. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 425 + 592 = 1017. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 40 × 93 = 3720. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 65 × 32 = 2077. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 288 + 666 = 954. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 286 + 931 = 1216. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 55 × 30 = 1651. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 584 + 957 = 1541. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 96 × 31 = 2976. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 25 × 36 = 900. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 520 + 654 = 1174. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 568 + 502 = 1070. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 73 × 32 = 2341. Correct or wrong? (a) wrong (b) correct

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