Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 459 · 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: 41 × 15 = 617. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 302 + 243 = 544. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 75 × 43 = 3220. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 971 + 761 = 1732. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 17 × 79 = 1349. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 26 × 45 = 1166. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 851 + 905 = 1756. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 96 × 87 = 8352. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 951 + 231 = 1182. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 18 × 73 = 1316. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 739 + 391 = 1132. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 391 + 621 = 1012. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 54 × 82 = 4428. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 950 + 648 = 1594. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 307 + 811 = 1126. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 55 × 38 = 2091. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 41 × 15 = 615. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 993 + 870 = 1871. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 466 + 466 = 932. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 275 + 325 = 600. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 35 × 52 = 1820. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 48 × 60 = 2878. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 28 × 61 = 1708. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 735 + 265 = 1002. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 895 + 797 = 1697. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 917 + 402 = 1317. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 842 + 744 = 1586. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 293 + 160 = 453. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 18 × 87 = 1566. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 755 + 935 = 1690. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 75 × 25 = 1876. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 989 + 493 = 1482. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 360 + 625 = 977. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 876 + 648 = 1524. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 600 + 242 = 842. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 94 × 42 = 3955. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 937 + 764 = 1701. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 86 × 95 = 8170. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 133 + 282 = 415. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 388 + 429 = 817. Correct or wrong? (a) wrong (b) correct

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