Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 709 · 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: 995 + 619 = 1611. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 27 × 56 = 1512. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 90 × 16 = 1438. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 155 + 931 = 1091. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 16 × 40 = 638. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 363 + 910 = 1273. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 34 × 65 = 2210. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 614 + 341 = 954. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 83 × 70 = 5806. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 66 × 46 = 3037. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 65 × 56 = 3642. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 741 + 542 = 1283. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 187 + 918 = 1105. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 14 × 54 = 756. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 27 × 47 = 1269. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 293 + 195 = 485. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 31 × 19 = 589. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 66 × 45 = 2972. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 356 + 711 = 1062. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 97 × 52 = 5044. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 915 + 701 = 1621. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 93 × 35 = 3255. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 26 × 45 = 1177. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 47 × 67 = 3152. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 183 + 670 = 853. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 58 × 53 = 3071. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 334 + 762 = 1096. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 541 + 373 = 916. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 378 + 665 = 1042. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 160 + 598 = 763. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 23 × 32 = 741. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 46 × 29 = 1326. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 585 + 222 = 800. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 41 × 50 = 2052. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 77 × 73 = 5613. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 591 + 677 = 1267. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 803 + 384 = 1187. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 817 + 532 = 1357. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 320 + 875 = 1191. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 574 + 494 = 1073. Correct or wrong? (a) wrong (b) correct

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