Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 129 · 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: 586 + 642 = 1228. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 532 + 144 = 680. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 781 + 165 = 946. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 518 + 655 = 1176. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 34 × 58 = 1972. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 637 + 788 = 1423. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 376 + 142 = 511. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 38 × 23 = 882. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 793 + 300 = 1093. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 351 + 813 = 1164. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 33 × 67 = 2211. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 931 + 634 = 1565. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 478 + 146 = 624. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 155 + 908 = 1063. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 127 + 132 = 256. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 98 × 59 = 5782. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 929 + 159 = 1088. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 41 × 86 = 3531. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 756 + 729 = 1485. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 50 × 78 = 3893. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 811 + 353 = 1165. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 23 × 78 = 1786. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 64 × 30 = 1920. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 20 × 99 = 1981. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 289 + 817 = 1112. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 37 × 86 = 3180. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 24 × 44 = 1048. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 49 × 21 = 1029. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 625 + 424 = 1049. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 61 × 93 = 5673. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 858 + 793 = 1643. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 76 × 96 = 7296. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 845 + 929 = 1773. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 294 + 245 = 539. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 99 × 76 = 7520. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 46 × 81 = 3718. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 945 + 361 = 1298. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 49 × 41 = 2012. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 91 × 42 = 3822. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 264 + 539 = 797. Correct or wrong? (a) correct (b) wrong

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