Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 557 · 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: 84 × 90 = 7562. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 12 × 79 = 949. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 79 × 45 = 3555. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 879 + 600 = 1479. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 74 × 26 = 1919. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 70 × 93 = 6510. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 58 × 54 = 3138. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 59 × 75 = 4426. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 56 × 56 = 3136. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 56 × 26 = 1451. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 906 + 466 = 1366. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 83 × 38 = 3154. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 366 + 366 = 730. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 661 + 299 = 960. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 599 + 301 = 908. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 81 × 41 = 3318. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 32 × 31 = 991. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 224 + 503 = 720. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 365 + 795 = 1156. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 17 × 18 = 306. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 66 × 21 = 1386. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 863 + 707 = 1570. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 219 + 858 = 1077. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 253 + 627 = 887. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 828 + 579 = 1407. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 41 × 42 = 1717. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 229 + 940 = 1169. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 36 × 37 = 1326. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 22 × 27 = 594. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 368 + 358 = 726. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 91 × 22 = 1997. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 582 + 319 = 901. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 896 + 241 = 1138. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 18 × 87 = 1566. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 867 + 192 = 1067. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 979 + 692 = 1671. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 84 × 75 = 6299. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 31 × 46 = 1423. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 41 × 44 = 1804. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 511 + 662 = 1166. Correct or wrong? (a) correct (b) wrong

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