Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 173 · 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: 918 + 782 = 1700. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 834 + 561 = 1395. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 946 + 995 = 1941. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 43 × 75 = 3225. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 960 + 206 = 1172. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 598 + 722 = 1320. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 40 × 34 = 1360. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 17 × 77 = 1309. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 698 + 653 = 1351. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 74 × 79 = 5846. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 52 × 39 = 2027. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 87 × 96 = 8352. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 448 + 599 = 1047. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 30 × 52 = 1560. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 55 × 28 = 1540. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 93 × 84 = 7812. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 306 + 178 = 484. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 98 × 48 = 4704. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 155 + 409 = 564. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 58 × 14 = 807. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 487 + 220 = 709. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 58 × 51 = 2963. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 65 × 85 = 5525. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 59 × 42 = 2478. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 253 + 421 = 674. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 405 + 343 = 748. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 928 + 550 = 1478. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 92 × 80 = 7360. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 33 × 78 = 2573. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 87 × 60 = 5221. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 679 + 588 = 1265. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 31 × 63 = 1945. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 69 × 52 = 3591. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 61 × 69 = 4209. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 70 × 25 = 1752. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 89 × 22 = 1960. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 70 × 61 = 4268. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 25 × 35 = 867. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 71 × 85 = 6032. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 181 + 653 = 837. Correct or wrong? (a) correct (b) wrong

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