Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 264 · 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: 12 × 21 = 246. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 362 + 180 = 542. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 160 + 601 = 761. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 68 × 18 = 1224. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 181 + 580 = 762. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 722 + 946 = 1668. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 328 + 608 = 930. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 434 + 149 = 583. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 660 + 965 = 1625. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 93 × 87 = 8091. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 168 + 783 = 948. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 324 + 338 = 656. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 81 × 17 = 1377. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 284 + 564 = 850. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 523 + 421 = 943. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 29 × 52 = 1501. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 52 × 52 = 2702. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 336 + 953 = 1296. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 63 × 57 = 3584. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 783 + 762 = 1545. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 95 × 18 = 1710. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 49 × 93 = 4559. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 431 + 668 = 1102. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 535 + 949 = 1485. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 71 × 85 = 6035. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 12 × 49 = 588. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 40 × 74 = 2960. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 15 × 96 = 1440. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 39 × 73 = 2852. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 501 + 587 = 1088. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 355 + 512 = 867. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 20 × 70 = 1395. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 30 × 13 = 392. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 180 + 222 = 402. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 79 × 41 = 3239. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 79 × 17 = 1349. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 99 × 57 = 5636. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 60 × 21 = 1260. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 781 + 174 = 962. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 14 × 87 = 1218. Correct or wrong? (a) wrong (b) correct

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