Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 431 · 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: 20 × 40 = 803. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 14 × 19 = 260. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 20 × 80 = 1601. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 46 × 22 = 1012. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 851 + 944 = 1795. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 135 + 424 = 562. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 129 + 195 = 324. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 74 × 62 = 4588. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 678 + 330 = 1000. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 675 + 755 = 1428. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 380 + 865 = 1240. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 53 × 72 = 3816. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 56 × 16 = 896. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 311 + 143 = 454. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 671 + 224 = 900. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 83 × 84 = 6972. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 45 × 84 = 3780. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 95 × 32 = 3041. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 879 + 338 = 1217. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 147 + 784 = 931. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 865 + 504 = 1369. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 74 × 51 = 3781. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 783 + 628 = 1411. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 16 × 87 = 1390. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 36 × 36 = 1296. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 83 × 17 = 1414. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 92 × 27 = 2480. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 82 × 71 = 5815. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 446 + 848 = 1295. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 76 × 34 = 2584. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 178 + 885 = 1063. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 196 + 245 = 441. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 77 × 66 = 5082. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 573 + 544 = 1117. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 66 × 68 = 4488. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 14 × 99 = 1386. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 54 × 14 = 756. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 514 + 752 = 1266. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 89 × 54 = 4806. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 91 × 64 = 5824. Correct or wrong? (a) wrong (b) correct

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