Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 492 · 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: 90 × 85 = 7650. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 917 + 904 = 1814. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 49 × 23 = 1127. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 510 + 697 = 1207. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 36 × 30 = 1080. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 15 × 12 = 185. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 31 × 85 = 2635. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 85 × 25 = 2128. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 38 × 26 = 988. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 618 + 305 = 923. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 152 + 950 = 1102. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 26 × 39 = 1018. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 20 × 59 = 1179. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 712 + 949 = 1663. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 96 × 77 = 7392. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 49 × 74 = 3626. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 79 × 17 = 1351. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 39 × 20 = 780. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 91 × 53 = 4823. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 559 + 798 = 1357. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 38 × 58 = 2204. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 752 + 413 = 1170. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 35 × 15 = 525. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 576 + 624 = 1200. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 759 + 672 = 1431. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 48 × 17 = 816. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 38 × 85 = 3230. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 54 × 56 = 3024. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 95 × 67 = 6368. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 582 + 733 = 1315. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 947 + 304 = 1256. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 71 × 45 = 3195. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 77 × 28 = 2163. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 373 + 747 = 1120. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 43 × 15 = 645. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 413 + 819 = 1234. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 49 × 66 = 3234. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 312 + 734 = 1046. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 913 + 563 = 1476. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 120 + 254 = 374. Correct or wrong? (a) wrong (b) correct

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