Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 574 · 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: 592 + 218 = 810. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 22 × 53 = 1174. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 125 + 888 = 1013. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 27 × 99 = 2673. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 89 × 57 = 5075. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 912 + 748 = 1660. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 74 × 12 = 888. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 16 × 19 = 304. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 588 + 401 = 994. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 980 + 771 = 1751. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 628 + 251 = 880. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 19 × 77 = 1463. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 138 + 582 = 724. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 67 × 70 = 4692. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 974 + 541 = 1515. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 59 × 13 = 769. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 77 × 17 = 1309. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 13 × 29 = 381. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 126 + 477 = 603. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 33 × 30 = 990. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 855 + 257 = 1112. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 41 × 79 = 3237. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 15 × 86 = 1290. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 151 + 755 = 906. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 29 × 90 = 2610. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 833 + 839 = 1672. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 21 × 49 = 1029. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 21 × 44 = 924. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 471 + 563 = 1042. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 201 + 123 = 324. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 89 × 12 = 1068. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 82 × 45 = 3689. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 92 × 12 = 1098. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 13 × 57 = 741. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 668 + 240 = 914. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 66 × 12 = 792. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 175 + 712 = 887. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 46 × 63 = 2899. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 475 + 298 = 772. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 143 + 135 = 276. Correct or wrong? (a) correct (b) wrong

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