Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 950 · 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: 36 × 25 = 899. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 514 + 848 = 1360. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 92 × 93 = 8556. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 42 × 40 = 1680. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 65 × 54 = 3510. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 358 + 449 = 799. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 84 × 85 = 7140. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 85 × 58 = 4938. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 599 + 633 = 1231. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 83 × 24 = 1992. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 598 + 392 = 992. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 463 + 152 = 621. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 148 + 479 = 627. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 91 × 73 = 6643. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 77 × 67 = 5161. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 243 + 365 = 608. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 120 + 404 = 520. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 16 × 13 = 203. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 26 × 35 = 913. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 787 + 587 = 1372. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 16 × 38 = 605. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 405 + 647 = 1052. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 397 + 325 = 718. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 122 + 293 = 415. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 965 + 928 = 1886. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 32 × 26 = 832. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 357 + 146 = 503. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 59 × 45 = 2655. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 76 × 86 = 6536. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 293 + 816 = 1110. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 76 × 26 = 1968. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 96 × 68 = 6528. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 51 × 79 = 4029. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 947 + 514 = 1453. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 630 + 220 = 850. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 803 + 394 = 1197. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 922 + 888 = 1810. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 833 + 209 = 1042. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 76 × 37 = 2812. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 468 + 377 = 841. Correct or wrong? (a) wrong (b) correct

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