Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 717 · 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: 306 + 844 = 1153. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 80 × 67 = 5360. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 50 × 51 = 2544. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 13 × 25 = 325. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 77 × 72 = 5544. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 73 × 61 = 4453. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 97 × 16 = 1546. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 810 + 135 = 953. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 509 + 133 = 646. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 648 + 423 = 1071. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 81 × 97 = 7857. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 23 × 20 = 460. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 34 × 31 = 1054. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 173 + 910 = 1083. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 641 + 234 = 875. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 842 + 858 = 1700. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 592 + 574 = 1158. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 73 × 77 = 5629. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 63 × 30 = 1890. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 154 + 288 = 437. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 855 + 203 = 1058. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 648 + 849 = 1497. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 18 × 17 = 306. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 57 × 18 = 1018. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 801 + 345 = 1153. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 89 × 66 = 5874. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 869 + 819 = 1688. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 821 + 844 = 1661. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 50 × 73 = 3650. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 292 + 505 = 797. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 371 + 659 = 1030. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 555 + 300 = 855. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 347 + 744 = 1091. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 134 + 679 = 813. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 34 × 27 = 922. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 379 + 256 = 632. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 38 × 23 = 869. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 93 × 56 = 5208. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 83 × 27 = 2241. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 17 × 35 = 601. Correct or wrong? (a) correct (b) wrong

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