Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 216 · 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: 17 × 21 = 357. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 311 + 404 = 715. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 86 × 86 = 7396. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 58 × 51 = 2963. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 60 × 91 = 5458. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 34 × 91 = 3086. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 74 × 36 = 2664. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 719 + 928 = 1647. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 14 × 52 = 728. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 48 × 44 = 2112. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 38 × 38 = 1444. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 343 + 603 = 946. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 23 × 85 = 1955. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 29 × 87 = 2516. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 91 × 56 = 5098. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 816 + 924 = 1733. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 855 + 520 = 1377. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 625 + 491 = 1112. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 35 × 83 = 2905. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 83 × 82 = 6806. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 34 × 75 = 2550. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 433 + 930 = 1363. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 978 + 348 = 1326. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 615 + 287 = 910. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 27 × 66 = 1782. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 35 × 17 = 595. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 83 × 45 = 3735. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 28 × 36 = 1008. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 60 × 83 = 4981. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 35 × 40 = 1400. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 98 × 12 = 1176. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 49 × 27 = 1324. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 124 + 425 = 549. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 537 + 349 = 886. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 89 × 24 = 2136. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 300 + 765 = 1068. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 352 + 834 = 1186. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 59 × 92 = 5428. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 85 × 60 = 5096. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 35 × 66 = 2310. Correct or wrong? (a) wrong (b) correct

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