Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 372 · 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: 55 × 41 = 2255. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 884 + 372 = 1256. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 639 + 484 = 1123. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 81 × 99 = 8014. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 311 + 599 = 910. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 28 × 15 = 415. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 23 × 38 = 874. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 245 + 157 = 402. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 184 + 845 = 1035. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 76 × 16 = 1218. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 851 + 372 = 1221. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 84 × 59 = 4956. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 92 × 71 = 6540. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 386 + 133 = 524. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 65 × 41 = 2665. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 459 + 170 = 629. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 53 × 98 = 5194. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 217 + 216 = 430. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 36 × 91 = 3276. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 72 × 75 = 5400. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 661 + 173 = 836. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 414 + 223 = 637. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 76 × 40 = 3040. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 282 + 147 = 429. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 45 × 28 = 1260. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 462 + 939 = 1400. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 226 + 854 = 1080. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 38 × 13 = 496. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 859 + 387 = 1246. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 981 + 210 = 1191. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 437 + 769 = 1202. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 863 + 886 = 1745. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 99 × 18 = 1776. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 70 × 32 = 2240. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 278 + 429 = 715. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 55 × 52 = 2860. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 682 + 792 = 1476. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 93 × 23 = 2139. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 44 × 81 = 3568. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 29 × 57 = 1653. Correct or wrong? (a) wrong (b) correct

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