Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 910 · 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: 32 × 54 = 1734. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 255 + 863 = 1118. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 13 × 44 = 575. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 408 + 666 = 1074. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 578 + 168 = 753. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 62 × 94 = 5828. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 428 + 940 = 1374. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 565 + 279 = 844. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 553 + 792 = 1340. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 829 + 452 = 1274. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 977 + 516 = 1493. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 67 × 39 = 2619. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 96 × 45 = 4317. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 72 × 21 = 1512. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 998 + 992 = 1987. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 311 + 162 = 473. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 19 × 23 = 440. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 175 + 283 = 462. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 78 × 71 = 5538. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 788 + 471 = 1259. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 175 + 501 = 676. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 92 × 34 = 3129. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 68 × 86 = 5848. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 339 + 868 = 1207. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 51 × 34 = 1737. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 46 × 92 = 4232. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 28 × 42 = 1174. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 196 + 977 = 1173. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 59 × 57 = 3365. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 68 × 33 = 2244. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 515 + 873 = 1388. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 71 × 66 = 4679. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 65 × 44 = 2860. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 908 + 570 = 1482. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 135 + 229 = 364. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 477 + 642 = 1118. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 19 × 37 = 703. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 943 + 497 = 1432. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 234 + 875 = 1109. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 50 × 62 = 3100. Correct or wrong? (a) wrong (b) correct

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