Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 425 · 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: 466 + 800 = 1258. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 166 + 620 = 786. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 40 × 85 = 3405. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 82 × 25 = 2056. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 458 + 432 = 890. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 94 × 77 = 7241. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 12 × 48 = 578. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 559 + 271 = 830. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 304 + 769 = 1073. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 897 + 274 = 1169. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 813 + 964 = 1769. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 35 × 61 = 2135. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 76 × 29 = 2198. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 42 × 18 = 756. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 90 × 33 = 2970. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 52 × 80 = 4155. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 408 + 523 = 926. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 701 + 204 = 906. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 347 + 209 = 550. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 79 × 25 = 1975. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 83 × 56 = 4655. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 204 + 465 = 667. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 70 × 53 = 3710. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 143 + 636 = 779. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 74 × 13 = 962. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 36 × 54 = 1946. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 69 × 57 = 3933. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 80 × 19 = 1512. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 47 × 53 = 2491. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 966 + 126 = 1092. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 440 + 292 = 734. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 23 × 13 = 300. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 33 × 20 = 655. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 66 × 33 = 2178. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 991 + 653 = 1645. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 71 × 39 = 2776. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 43 × 97 = 4163. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 578 + 313 = 891. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 258 + 603 = 868. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 33 × 29 = 961. Correct or wrong? (a) wrong (b) correct

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