Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 687 · 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: 890 + 975 = 1864. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 46 × 29 = 1334. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 700 + 467 = 1167. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 36 × 23 = 828. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 31 × 46 = 1419. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 88 × 93 = 8186. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 675 + 657 = 1332. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 17 × 83 = 1411. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 920 + 234 = 1154. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 20 × 78 = 1561. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 508 + 791 = 1307. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 286 + 908 = 1194. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 59 × 70 = 4130. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 30 × 43 = 1290. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 25 × 37 = 925. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 13 × 28 = 364. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 92 × 18 = 1656. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 754 + 289 = 1043. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 32 × 56 = 1787. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 373 + 156 = 527. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 95 × 64 = 6080. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 16 × 21 = 336. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 526 + 811 = 1337. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 48 × 77 = 3700. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 763 + 318 = 1082. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 32 × 49 = 1568. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 37 × 37 = 1369. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 637 + 527 = 1170. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 90 × 75 = 6751. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 61 × 58 = 3540. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 15 × 82 = 1230. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 50 × 35 = 1750. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 76 × 64 = 4868. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 217 + 832 = 1053. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 295 + 629 = 925. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 38 × 29 = 1102. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 17 × 76 = 1292. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 32 × 99 = 3168. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 19 × 69 = 1311. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 608 + 246 = 854. Correct or wrong? (a) wrong (b) correct

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