Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 125 · 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: 191 + 355 = 544. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 46 × 90 = 4135. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 62 × 82 = 5083. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 41 × 36 = 1471. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 66 × 88 = 5808. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 57 × 34 = 1941. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 468 + 367 = 835. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 71 × 23 = 1641. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 533 + 261 = 797. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 270 + 656 = 924. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 77 × 63 = 4851. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 897 + 627 = 1524. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 29 × 18 = 519. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 23 × 82 = 1890. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 864 + 514 = 1377. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 675 + 705 = 1380. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 368 + 999 = 1367. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 37 × 88 = 3256. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 49 × 63 = 3087. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 425 + 983 = 1408. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 16 × 62 = 992. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 233 + 510 = 741. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 14 × 24 = 339. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 160 + 641 = 805. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 782 + 142 = 924. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 92 × 77 = 7084. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 598 + 301 = 900. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 229 + 169 = 393. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 65 × 60 = 3902. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 362 + 266 = 628. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 645 + 372 = 1022. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 58 × 84 = 4872. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 99 × 61 = 6039. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 68 × 37 = 2515. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 89 × 16 = 1424. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 40 × 94 = 3756. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 92 × 96 = 8837. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 76 × 98 = 7448. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 27 × 20 = 540. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 461 + 544 = 1005. Correct or wrong? (a) wrong (b) correct

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