Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 635 · 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: 906 + 140 = 1046. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 770 + 924 = 1686. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 75 × 97 = 7283. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 19 × 96 = 1824. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 39 × 18 = 694. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 79 × 25 = 1975. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 59 × 15 = 885. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 378 + 863 = 1241. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 38 × 97 = 3692. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 167 + 832 = 1001. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 17 × 22 = 377. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 77 × 44 = 3388. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 881 + 446 = 1327. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 312 + 224 = 531. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 377 + 290 = 667. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 370 + 548 = 918. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 773 + 830 = 1605. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 288 + 891 = 1179. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 72 × 47 = 3384. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 66 × 73 = 4811. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 86 × 78 = 6708. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 483 + 975 = 1463. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 72 × 21 = 1512. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 34 × 55 = 1862. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 66 × 15 = 990. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 470 + 511 = 981. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 85 × 96 = 8164. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 360 + 435 = 795. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 966 + 177 = 1143. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 41 × 27 = 1108. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 79 × 66 = 5209. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 706 + 136 = 846. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 166 + 766 = 932. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 77 × 22 = 1694. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 59 × 88 = 5194. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 24 × 33 = 792. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 966 + 547 = 1508. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 23 × 21 = 483. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 811 + 624 = 1435. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 77 × 57 = 4389. Correct or wrong? (a) wrong (b) correct

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