Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 101 · 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: 403 + 462 = 863. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 21 × 26 = 548. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 765 + 809 = 1574. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 80 × 71 = 5680. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 64 × 58 = 3710. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 63 × 16 = 1000. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 56 × 23 = 1280. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 49 × 55 = 2695. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 81 × 54 = 4374. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 99 × 64 = 6336. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 65 × 72 = 4680. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 13 × 16 = 210. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 16 × 91 = 1456. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 741 + 611 = 1352. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 514 + 374 = 888. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 95 × 43 = 4085. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 838 + 361 = 1197. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 42 × 70 = 2940. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 15 × 88 = 1320. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 61 × 94 = 5738. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 41 × 20 = 820. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 986 + 577 = 1570. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 73 × 43 = 3139. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 742 + 775 = 1513. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 710 + 886 = 1603. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 616 + 467 = 1083. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 73 × 21 = 1533. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 955 + 158 = 1113. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 353 + 174 = 535. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 27 × 37 = 1000. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 92 × 46 = 4238. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 287 + 135 = 422. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 501 + 860 = 1361. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 121 + 965 = 1082. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 93 × 22 = 2048. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 93 × 38 = 3535. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 255 + 894 = 1142. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 923 + 555 = 1483. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 367 + 226 = 594. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 985 + 628 = 1612. Correct or wrong? (a) wrong (b) correct

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