Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 485 · 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: 48 × 70 = 3360. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 363 + 831 = 1194. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 34 × 69 = 2346. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 18 × 23 = 414. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 72 × 57 = 4101. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 33 × 16 = 528. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 347 + 930 = 1275. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 86 × 21 = 1806. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 573 + 465 = 1038. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 65 × 45 = 2932. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 95 × 93 = 8832. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 70 × 55 = 3850. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 896 + 641 = 1541. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 21 × 89 = 1869. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 273 + 205 = 478. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 906 + 722 = 1628. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 84 × 76 = 6384. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 125 + 812 = 937. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 74 × 39 = 2885. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 15 × 85 = 1280. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 93 × 19 = 1773. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 756 + 943 = 1699. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 65 × 33 = 2145. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 19 × 45 = 858. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 41 × 18 = 738. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 25 × 23 = 581. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 59 × 67 = 3953. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 24 × 41 = 988. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 816 + 362 = 1178. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 17 × 84 = 1428. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 54 × 57 = 3070. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 56 × 39 = 2187. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 597 + 197 = 801. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 130 + 421 = 547. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 89 × 77 = 6853. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 284 + 250 = 534. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 831 + 447 = 1278. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 304 + 122 = 426. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 26 × 91 = 2367. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 858 + 219 = 1077. Correct or wrong? (a) correct (b) wrong

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