Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 622 · 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: 250 + 966 = 1210. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 217 + 226 = 443. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 314 + 320 = 634. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 25 × 92 = 2304. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 31 × 37 = 1147. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 12 × 26 = 308. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 918 + 222 = 1140. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 953 + 283 = 1242. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 572 + 796 = 1361. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 825 + 596 = 1420. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 79 × 54 = 4264. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 249 + 508 = 751. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 873 + 978 = 1851. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 33 × 27 = 894. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 41 × 50 = 2044. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 150 + 604 = 754. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 24 × 42 = 1013. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 55 × 53 = 2921. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 421 + 893 = 1314. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 811 + 821 = 1631. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 36 × 94 = 3384. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 221 + 792 = 1013. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 65 × 21 = 1366. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 863 + 935 = 1802. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 83 × 13 = 1079. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 913 + 388 = 1301. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 440 + 257 = 701. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 433 + 483 = 919. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 237 + 566 = 797. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 30 × 69 = 2065. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 924 + 376 = 1300. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 74 × 42 = 3109. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 481 + 700 = 1173. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 425 + 369 = 798. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 84 × 13 = 1094. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 168 + 378 = 546. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 229 + 558 = 787. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 19 × 29 = 551. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 25 × 22 = 550. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 973 + 294 = 1267. Correct or wrong? (a) wrong (b) correct

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