Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 245 · 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: 554 + 887 = 1441. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 40 × 30 = 1198. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 34 × 25 = 850. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 667 + 750 = 1422. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 238 + 239 = 477. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 15 × 51 = 765. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 27 × 87 = 2351. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 644 + 861 = 1505. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 15 × 28 = 420. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 37 × 70 = 2590. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 24 × 98 = 2352. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 16 × 16 = 256. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 922 + 951 = 1873. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 516 + 551 = 1067. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 824 + 819 = 1643. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 93 × 30 = 2790. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 31 × 28 = 868. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 401 + 990 = 1391. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 65 × 78 = 5064. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 650 + 486 = 1136. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 177 + 197 = 374. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 20 × 50 = 1000. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 647 + 788 = 1439. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 625 + 539 = 1159. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 840 + 326 = 1163. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 609 + 256 = 858. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 74 × 17 = 1258. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 131 + 173 = 309. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 23 × 55 = 1265. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 18 × 63 = 1134. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 660 + 521 = 1181. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 65 × 20 = 1306. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 86 × 52 = 4480. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 43 × 46 = 1979. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 508 + 321 = 823. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 54 × 58 = 3132. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 12 × 91 = 1096. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 15 × 44 = 660. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 82 × 64 = 5249. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 505 + 161 = 661. Correct or wrong? (a) wrong (b) correct

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