Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 612 · 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: 66 × 31 = 2046. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 78 × 59 = 4602. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 80 × 55 = 4400. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 38 × 87 = 3307. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 289 + 446 = 737. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 362 + 346 = 710. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 954 + 135 = 1089. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 659 + 948 = 1607. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 28 × 85 = 2386. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 549 + 334 = 883. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 86 × 70 = 6020. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 690 + 159 = 849. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 24 × 81 = 1936. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 818 + 349 = 1163. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 73 × 38 = 2774. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 326 + 728 = 1054. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 56 × 60 = 3355. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 77 × 16 = 1226. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 90 × 37 = 3330. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 13 × 99 = 1282. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 99 × 14 = 1384. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 86 × 59 = 5074. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 86 × 29 = 2494. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 382 + 152 = 534. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 278 + 896 = 1174. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 754 + 893 = 1647. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 98 × 54 = 5292. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 956 + 435 = 1391. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 593 + 522 = 1115. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 139 + 537 = 676. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 82 × 24 = 1968. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 206 + 248 = 454. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 78 × 89 = 6942. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 39 × 96 = 3744. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 672 + 376 = 1048. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 30 × 49 = 1475. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 859 + 316 = 1169. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 15 × 40 = 600. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 13 × 29 = 376. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 32 × 71 = 2272. Correct or wrong? (a) correct (b) wrong

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