Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 468 · 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: 70 × 38 = 2660. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 52 × 60 = 3120. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 51 × 23 = 1173. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 41 × 29 = 1191. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 81 × 50 = 4050. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 43 × 81 = 3483. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 372 + 816 = 1180. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 243 + 355 = 604. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 63 × 51 = 3215. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 78 × 72 = 5616. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 79 × 79 = 6245. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 531 + 538 = 1067. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 306 + 142 = 443. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 20 × 33 = 660. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 71 × 80 = 5680. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 52 × 71 = 3687. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 26 × 12 = 317. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 43 × 21 = 903. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 419 + 467 = 886. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 41 × 40 = 1644. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 183 + 929 = 1112. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 41 × 78 = 3192. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 61 × 55 = 3355. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 69 × 91 = 6272. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 721 + 909 = 1630. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 27 × 26 = 701. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 76 × 77 = 5854. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 297 + 130 = 427. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 68 × 34 = 2312. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 973 + 248 = 1221. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 95 × 20 = 1899. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 777 + 850 = 1621. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 27 × 87 = 2349. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 24 × 21 = 499. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 12 × 45 = 547. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 68 × 57 = 3876. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 335 + 931 = 1266. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 48 × 25 = 1203. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 911 + 128 = 1039. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 966 + 160 = 1131. Correct or wrong? (a) wrong (b) correct

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