Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 176 · 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: 29 × 40 = 1160. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 176 + 928 = 1098. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 28 × 32 = 896. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 466 + 266 = 725. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 36 × 71 = 2556. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 50 × 19 = 950. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 74 × 49 = 3626. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 886 + 281 = 1160. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 51 × 73 = 3727. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 708 + 382 = 1083. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 99 × 23 = 2274. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 598 + 605 = 1198. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 790 + 839 = 1627. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 74 × 93 = 6888. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 48 × 17 = 816. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 82 × 84 = 6881. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 86 × 89 = 7661. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 47 × 15 = 705. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 269 + 275 = 547. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 13 × 21 = 273. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 905 + 578 = 1483. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 65 × 63 = 4103. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 554 + 623 = 1179. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 58 × 31 = 1798. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 94 × 27 = 2538. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 199 + 627 = 819. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 43 × 72 = 3090. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 38 × 62 = 2356. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 995 + 287 = 1282. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 21 × 89 = 1869. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 36 × 96 = 3459. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 73 × 89 = 6497. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 318 + 476 = 794. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 278 + 798 = 1076. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 530 + 300 = 833. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 851 + 293 = 1144. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 266 + 171 = 437. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 76 × 83 = 6307. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 93 × 58 = 5394. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 81 × 17 = 1375. Correct or wrong? (a) wrong (b) correct

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