Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 464 · 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: 923 + 231 = 1154. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 70 × 59 = 4133. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 96 × 34 = 3264. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 623 + 424 = 1052. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 65 × 64 = 4159. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 13 × 78 = 1018. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 83 × 15 = 1245. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 23 × 44 = 1018. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 32 × 39 = 1254. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 61 × 49 = 2996. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 34 × 45 = 1530. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 16 × 33 = 528. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 595 + 678 = 1273. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 452 + 426 = 882. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 442 + 451 = 893. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 442 + 336 = 778. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 227 + 998 = 1225. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 463 + 590 = 1056. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 570 + 789 = 1359. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 66 × 43 = 2838. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 711 + 164 = 875. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 63 × 24 = 1512. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 41 × 12 = 492. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 21 × 56 = 1176. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 79 × 44 = 3473. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 886 + 483 = 1369. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 933 + 915 = 1848. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 244 + 970 = 1214. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 67 × 56 = 3752. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 91 × 28 = 2548. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 20 × 52 = 1040. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 707 + 152 = 859. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 63 × 15 = 945. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 36 × 29 = 1036. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 95 × 63 = 5985. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 22 × 61 = 1350. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 58 × 29 = 1674. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 237 + 180 = 412. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 70 × 38 = 2655. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 37 × 58 = 2146. Correct or wrong? (a) wrong (b) correct

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