Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 526 · 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: 199 + 828 = 1021. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 238 + 532 = 770. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 26 × 34 = 877. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 24 × 82 = 1971. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 661 + 958 = 1619. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 69 × 37 = 2553. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 77 × 45 = 3457. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 36 × 25 = 900. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 57 × 89 = 5073. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 36 × 91 = 3273. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 15 × 40 = 600. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 210 + 223 = 433. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 34 × 73 = 2482. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 37 × 32 = 1184. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 98 × 56 = 5487. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 18 × 79 = 1428. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 19 × 60 = 1146. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 59 × 76 = 4484. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 96 × 80 = 7683. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 499 + 600 = 1099. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 62 × 98 = 6068. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 20 × 66 = 1320. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 46 × 12 = 552. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 638 + 394 = 1038. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 958 + 595 = 1552. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 16 × 58 = 928. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 297 + 913 = 1209. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 48 × 95 = 4560. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 60 × 87 = 5220. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 30 × 16 = 474. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 92 × 44 = 4048. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 551 + 929 = 1486. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 623 + 326 = 954. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 896 + 351 = 1247. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 43 × 85 = 3655. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 264 + 489 = 753. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 491 + 209 = 700. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 75 × 53 = 3971. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 857 + 979 = 1829. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 73 × 61 = 4460. Correct or wrong? (a) correct (b) wrong

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