Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 298 · 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: 193 + 398 = 591. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 943 + 289 = 1227. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 92 × 52 = 4792. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 797 + 625 = 1416. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 78 × 15 = 1170. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 79 × 51 = 4030. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 904 + 152 = 1056. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 92 × 28 = 2576. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 33 × 24 = 792. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 662 + 205 = 867. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 777 + 349 = 1126. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 39 × 68 = 2652. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 84 × 92 = 7728. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 40 × 51 = 2040. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 86 × 61 = 5246. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 614 + 350 = 964. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 23 × 41 = 943. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 60 × 85 = 5102. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 247 + 720 = 967. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 195 + 415 = 603. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 997 + 460 = 1457. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 22 × 36 = 792. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 30 × 75 = 2246. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 39 × 97 = 3782. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 97 × 15 = 1455. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 88 × 34 = 2992. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 29 × 33 = 965. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 78 × 40 = 3120. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 22 × 17 = 381. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 55 × 55 = 3025. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 830 + 605 = 1436. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 285 + 944 = 1229. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 13 × 19 = 252. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 61 × 24 = 1462. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 13 × 92 = 1196. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 307 + 310 = 617. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 24 × 28 = 677. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 48 × 67 = 3216. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 91 × 31 = 2814. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 58 × 12 = 691. Correct or wrong? (a) wrong (b) correct

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