Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 243 · 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: 336 + 734 = 1070. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 72 × 22 = 1584. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 20 × 49 = 980. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 99 × 37 = 3665. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 63 × 84 = 5284. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 670 + 975 = 1647. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 81 × 23 = 1863. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 973 + 204 = 1185. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 800 + 819 = 1619. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 42 × 59 = 2478. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 218 + 348 = 566. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 35 × 76 = 2656. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 77 × 83 = 6391. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 724 + 857 = 1581. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 99 × 97 = 9597. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 688 + 347 = 1035. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 46 × 44 = 2016. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 99 × 37 = 3667. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 939 + 170 = 1106. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 241 + 766 = 1007. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 15 × 37 = 555. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 453 + 609 = 1063. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 63 × 46 = 2898. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 89 × 43 = 3834. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 620 + 423 = 1043. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 917 + 601 = 1514. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 79 × 62 = 4899. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 36 × 93 = 3355. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 53 × 19 = 1006. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 857 + 423 = 1280. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 30 × 39 = 1176. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 21 × 79 = 1665. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 310 + 734 = 1044. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 424 + 162 = 587. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 450 + 960 = 1416. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 84 × 34 = 2850. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 37 × 36 = 1332. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 58 × 99 = 5742. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 84 × 56 = 4704. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 27 × 43 = 1159. Correct or wrong? (a) correct (b) wrong

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