Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 791 · 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: 68 × 92 = 6257. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 32 × 48 = 1529. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 835 + 175 = 1012. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 73 × 26 = 1898. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 564 + 357 = 915. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 78 × 13 = 1014. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 47 × 31 = 1464. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 18 × 36 = 648. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 992 + 926 = 1919. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 35 × 20 = 705. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 46 × 96 = 4416. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 968 + 819 = 1787. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 12 × 63 = 756. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 624 + 955 = 1579. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 858 + 176 = 1034. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 249 + 658 = 907. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 32 × 50 = 1603. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 66 × 73 = 4818. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 883 + 176 = 1061. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 951 + 392 = 1350. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 830 + 497 = 1326. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 417 + 881 = 1298. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 303 + 814 = 1125. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 99 × 62 = 6138. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 492 + 482 = 971. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 252 + 372 = 624. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 13 × 39 = 508. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 15 × 32 = 473. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 14 × 97 = 1357. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 41 × 74 = 3039. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 31 × 27 = 837. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 311 + 884 = 1193. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 26 × 19 = 496. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 36 × 64 = 2304. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 508 + 662 = 1164. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 211 + 348 = 558. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 955 + 853 = 1808. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 23 × 52 = 1196. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 18 × 24 = 425. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 46 × 60 = 2760. Correct or wrong? (a) correct (b) wrong

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