Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 363 · 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 × 74 = 5032. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 761 + 282 = 1051. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 76 × 66 = 5015. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 82 × 68 = 5571. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 18 × 59 = 1061. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 94 × 80 = 7513. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 607 + 700 = 1306. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 201 + 344 = 545. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 245 + 843 = 1088. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 38 × 49 = 1869. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 270 + 825 = 1095. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 79 × 17 = 1335. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 31 × 26 = 801. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 242 + 332 = 574. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 74 × 69 = 5098. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 66 × 45 = 2978. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 681 + 196 = 881. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 517 + 553 = 1077. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 33 × 63 = 2085. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 839 + 207 = 1043. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 83 × 64 = 5318. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 69 × 83 = 5727. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 855 + 786 = 1643. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 938 + 828 = 1766. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 293 + 337 = 628. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 988 + 629 = 1617. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 192 + 895 = 1080. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 87 × 67 = 5829. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 22 × 46 = 1013. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 70 × 26 = 1820. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 782 + 797 = 1579. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 244 + 301 = 545. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 65 × 66 = 4290. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 897 + 346 = 1245. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 98 × 70 = 6860. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 74 × 93 = 6882. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 77 × 12 = 922. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 19 × 75 = 1425. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 643 + 327 = 970. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 66 × 43 = 2838. Correct or wrong? (a) wrong (b) correct

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