Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 818 · 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: 426 + 242 = 663. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 311 + 692 = 1003. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 21 × 87 = 1834. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 884 + 163 = 1047. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 28 × 94 = 2632. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 74 × 33 = 2442. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 17 × 59 = 1000. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 405 + 167 = 572. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 943 + 249 = 1194. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 13 × 46 = 600. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 40 × 34 = 1360. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 71 × 97 = 6887. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 933 + 843 = 1776. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 88 × 95 = 8362. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 915 + 948 = 1862. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 50 × 26 = 1300. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 933 + 901 = 1836. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 53 × 20 = 1060. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 438 + 332 = 770. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 17 × 94 = 1598. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 387 + 232 = 619. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 928 + 289 = 1223. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 700 + 567 = 1267. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 622 + 181 = 803. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 85 × 96 = 8152. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 84 × 25 = 2108. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 55 × 81 = 4451. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 511 + 500 = 1011. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 466 + 390 = 856. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 61 × 66 = 4026. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 725 + 194 = 913. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 20 × 99 = 1980. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 349 + 638 = 987. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 40 × 55 = 2202. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 51 × 30 = 1530. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 37 × 57 = 2109. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 974 + 381 = 1355. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 346 + 866 = 1216. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 732 + 249 = 981. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 33 × 31 = 1023. Correct or wrong? (a) wrong (b) correct

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