Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 855 · 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: 423 + 982 = 1405. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 181 + 709 = 890. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 96 × 85 = 8158. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 23 × 67 = 1544. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 44 × 22 = 968. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 81 × 28 = 2260. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 89 × 47 = 4189. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 35 × 58 = 2030. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 94 × 17 = 1598. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 50 × 15 = 750. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 719 + 788 = 1513. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 153 + 816 = 969. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 714 + 365 = 1079. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 666 + 817 = 1486. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 20 × 29 = 580. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 283 + 882 = 1165. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 544 + 493 = 1031. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 90 × 31 = 2790. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 173 + 197 = 371. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 92 × 55 = 5060. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 271 + 294 = 565. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 63 × 94 = 5930. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 660 + 321 = 981. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 20 × 30 = 600. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 394 + 445 = 839. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 469 + 569 = 1038. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 261 + 659 = 920. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 859 + 593 = 1460. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 597 + 755 = 1352. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 680 + 956 = 1628. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 215 + 498 = 719. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 27 × 49 = 1321. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 67 × 92 = 6161. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 438 + 262 = 698. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 702 + 677 = 1377. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 17 × 59 = 1008. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 825 + 707 = 1532. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 97 × 68 = 6596. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 322 + 167 = 492. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 504 + 319 = 817. Correct or wrong? (a) wrong (b) correct

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