Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 85 · 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: 402 + 589 = 989. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 601 + 777 = 1378. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 35 × 20 = 700. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 251 + 779 = 1030. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 69 × 44 = 3036. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 61 × 20 = 1228. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 85 × 67 = 5695. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 42 × 78 = 3276. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 87 × 47 = 4082. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 75 × 31 = 2325. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 85 × 33 = 2805. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 74 × 99 = 7326. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 68 × 45 = 3053. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 229 + 232 = 461. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 977 + 755 = 1733. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 61 × 12 = 733. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 35 × 36 = 1260. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 863 + 956 = 1819. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 66 × 76 = 5016. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 74 × 41 = 3034. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 80 × 30 = 2400. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 15 × 25 = 375. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 16 × 35 = 560. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 51 × 31 = 1581. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 152 + 631 = 785. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 48 × 13 = 627. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 66 × 81 = 5346. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 86 × 38 = 3268. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 841 + 993 = 1834. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 71 × 26 = 1842. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 49 × 80 = 3924. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 19 × 17 = 318. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 771 + 990 = 1761. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 27 × 12 = 324. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 34 × 61 = 2074. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 366 + 655 = 1021. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 227 + 222 = 449. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 78 × 19 = 1482. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 958 + 716 = 1674. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 46 × 96 = 4416. Correct or wrong? (a) correct (b) wrong

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