Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 963 · 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: 17 × 72 = 1218. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 511 + 999 = 1510. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 45 × 86 = 3866. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 939 + 266 = 1205. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 68 × 20 = 1354. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 232 + 350 = 579. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 92 × 62 = 5704. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 33 × 87 = 2874. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 367 + 560 = 927. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 486 + 979 = 1465. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 780 + 611 = 1390. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 45 × 98 = 4410. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 38 × 92 = 3491. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 46 × 85 = 3910. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 57 × 37 = 2109. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 34 × 12 = 403. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 96 × 68 = 6528. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 45 × 39 = 1750. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 28 × 27 = 761. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 58 × 79 = 4581. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 57 × 70 = 3989. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 93 × 52 = 4836. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 581 + 536 = 1117. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 65 × 98 = 6362. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 407 + 802 = 1212. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 232 + 573 = 801. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 134 + 449 = 583. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 14 × 67 = 932. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 587 + 334 = 921. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 948 + 461 = 1409. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 40 × 47 = 1880. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 34 × 88 = 2993. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 86 × 16 = 1376. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 32 × 60 = 1920. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 89 × 90 = 8013. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 55 × 79 = 4347. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 26 × 81 = 2107. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 683 + 343 = 1026. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 215 + 614 = 829. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 24 × 31 = 744. Correct or wrong? (a) correct (b) wrong

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