Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 953 · 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: 926 + 125 = 1047. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 97 × 34 = 3298. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 15 × 13 = 195. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 12 × 26 = 312. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 92 × 98 = 9016. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 672 + 832 = 1504. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 286 + 490 = 773. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 31 × 31 = 957. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 92 × 97 = 8924. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 25 × 84 = 2101. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 33 × 79 = 2607. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 754 + 184 = 938. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 461 + 297 = 758. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 47 × 75 = 3525. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 43 × 76 = 3268. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 917 + 273 = 1182. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 38 × 40 = 1520. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 941 + 807 = 1748. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 20 × 92 = 1832. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 229 + 624 = 858. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 71 × 28 = 1985. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 283 + 377 = 665. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 181 + 346 = 531. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 37 × 23 = 847. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 726 + 147 = 873. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 20 × 40 = 805. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 97 × 13 = 1256. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 420 + 559 = 978. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 724 + 726 = 1450. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 27 × 22 = 599. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 706 + 252 = 958. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 47 × 44 = 2073. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 542 + 771 = 1318. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 81 × 36 = 2916. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 25 × 49 = 1225. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 70 × 47 = 3282. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 708 + 498 = 1206. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 13 × 43 = 559. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 23 × 26 = 598. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 73 × 43 = 3139. Correct or wrong? (a) correct (b) wrong

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