Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 585 · 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: 63 × 92 = 5790. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 56 × 84 = 4704. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 267 + 559 = 832. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 23 × 19 = 429. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 503 + 503 = 1006. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 97 × 75 = 7275. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 810 + 511 = 1321. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 92 × 28 = 2576. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 84 × 24 = 2016. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 75 × 99 = 7425. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 244 + 468 = 712. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 713 + 292 = 1005. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 27 × 86 = 2323. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 46 × 42 = 1932. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 64 × 96 = 6151. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 922 + 735 = 1657. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 85 × 99 = 8416. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 15 × 37 = 555. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 749 + 952 = 1698. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 98 × 84 = 8230. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 746 + 412 = 1158. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 56 × 30 = 1680. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 641 + 135 = 784. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 409 + 899 = 1308. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 828 + 372 = 1198. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 385 + 972 = 1357. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 73 × 22 = 1612. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 97 × 87 = 8433. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 83 × 74 = 6142. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 839 + 265 = 1104. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 415 + 661 = 1076. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 711 + 333 = 1036. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 97 × 96 = 9312. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 24 × 69 = 1656. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 761 + 953 = 1714. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 450 + 925 = 1375. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 61 × 21 = 1281. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 775 + 436 = 1214. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 554 + 353 = 907. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 73 × 55 = 4015. Correct or wrong? (a) wrong (b) correct

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