Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 317 · 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: 163 + 872 = 1037. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 835 + 142 = 977. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 801 + 966 = 1762. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 38 × 67 = 2546. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 188 + 923 = 1116. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 62 × 84 = 5207. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 715 + 722 = 1437. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 449 + 199 = 642. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 40 × 67 = 2683. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 29 × 29 = 840. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 29 × 64 = 1862. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 46 × 14 = 645. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 523 + 655 = 1183. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 352 + 344 = 694. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 17 × 49 = 833. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 303 + 164 = 460. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 15 × 25 = 375. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 58 × 69 = 4002. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 78 × 13 = 1014. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 68 × 88 = 5984. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 68 × 27 = 1835. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 505 + 651 = 1161. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 42 × 39 = 1643. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 55 × 92 = 5055. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 99 × 72 = 7126. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 92 × 49 = 4508. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 89 × 85 = 7570. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 93 × 14 = 1302. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 728 + 260 = 988. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 77 × 27 = 2082. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 36 × 65 = 2340. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 463 + 494 = 957. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 21 × 41 = 869. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 35 × 48 = 1680. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 368 + 321 = 689. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 637 + 714 = 1351. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 42 × 17 = 720. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 254 + 460 = 720. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 75 × 73 = 5473. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 14 × 59 = 825. Correct or wrong? (a) wrong (b) correct

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