Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 915 · 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: 952 + 853 = 1805. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 24 × 17 = 408. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 63 × 66 = 4156. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 455 + 350 = 811. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 737 + 674 = 1411. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 296 + 616 = 917. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 60 × 18 = 1080. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 45 × 74 = 3330. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 927 + 382 = 1310. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 50 × 89 = 4450. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 92 × 68 = 6256. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 489 + 272 = 761. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 14 × 37 = 522. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 738 + 944 = 1680. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 23 × 29 = 667. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 79 × 51 = 4029. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 56 × 42 = 2360. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 128 + 233 = 361. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 84 × 53 = 4452. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 73 × 65 = 4746. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 223 + 556 = 779. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 47 × 12 = 569. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 17 × 15 = 255. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 595 + 975 = 1570. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 30 × 72 = 2159. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 905 + 623 = 1528. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 32 × 28 = 896. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 391 + 487 = 878. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 91 × 59 = 5369. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 130 + 735 = 870. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 77 × 32 = 2464. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 56 × 24 = 1344. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 84 × 30 = 2520. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 93 × 42 = 3906. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 94 × 48 = 4512. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 38 × 37 = 1405. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 46 × 89 = 4094. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 22 × 82 = 1796. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 243 + 956 = 1199. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 37 × 76 = 2812. Correct or wrong? (a) wrong (b) correct

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