Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 158 · 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: 136 + 811 = 947. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 66 × 82 = 5412. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 36 × 74 = 2664. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 814 + 274 = 1091. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 131 + 964 = 1095. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 62 × 36 = 2232. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 486 + 803 = 1289. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 38 × 31 = 1183. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 126 + 901 = 1027. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 48 × 39 = 1864. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 64 × 65 = 4166. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 565 + 430 = 995. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 379 + 948 = 1327. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 23 × 12 = 270. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 29 × 89 = 2581. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 69 × 56 = 3864. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 903 + 749 = 1652. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 84 × 36 = 3024. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 74 × 68 = 5032. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 61 × 73 = 4453. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 231 + 250 = 483. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 731 + 612 = 1345. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 79 × 43 = 3397. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 48 × 36 = 1728. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 57 × 53 = 3021. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 770 + 292 = 1064. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 53 × 14 = 742. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 20 × 63 = 1260. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 882 + 700 = 1586. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 56 × 62 = 3472. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 615 + 997 = 1608. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 43 × 13 = 559. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 28 × 77 = 2156. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 653 + 446 = 1100. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 68 × 37 = 2516. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 55 × 13 = 720. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 66 × 28 = 1840. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 78 × 73 = 5694. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 805 + 466 = 1271. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 140 + 756 = 896. Correct or wrong? (a) wrong (b) correct

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