Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 482 · 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: 96 × 52 = 4993. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 80 × 40 = 3208. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 37 × 20 = 736. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 59 × 30 = 1770. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 99 × 20 = 1980. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 51 × 47 = 2397. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 920 + 546 = 1470. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 710 + 440 = 1154. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 519 + 892 = 1414. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 85 × 93 = 7908. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 64 × 20 = 1285. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 57 × 78 = 4440. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 42 × 34 = 1428. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 617 + 914 = 1531. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 340 + 577 = 917. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 36 × 38 = 1376. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 40 × 58 = 2316. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 19 × 46 = 869. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 381 + 297 = 679. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 21 × 31 = 651. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 638 + 381 = 1019. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 343 + 900 = 1243. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 154 + 216 = 370. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 62 × 75 = 4644. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 364 + 600 = 964. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 916 + 121 = 1041. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 28 × 74 = 2077. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 728 + 224 = 949. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 46 × 57 = 2624. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 168 + 198 = 366. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 91 × 68 = 6188. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 99 × 40 = 3962. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 683 + 873 = 1557. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 406 + 148 = 554. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 99 × 22 = 2178. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 14 × 29 = 411. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 98 × 25 = 2455. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 555 + 572 = 1127. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 211 + 366 = 577. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 29 × 74 = 2149. Correct or wrong? (a) correct (b) wrong

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