Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 361 · 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: 42 × 25 = 1049. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 880 + 224 = 1104. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 685 + 181 = 864. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 617 + 995 = 1612. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 32 × 61 = 1960. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 14 × 96 = 1345. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 65 × 30 = 1943. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 36 × 77 = 2772. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 847 + 489 = 1336. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 710 + 985 = 1695. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 83 × 41 = 3403. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 585 + 556 = 1141. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 337 + 672 = 1009. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 319 + 167 = 491. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 23 × 74 = 1705. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 99 × 75 = 7425. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 54 × 35 = 1883. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 90 × 90 = 8100. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 78 × 22 = 1708. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 56 × 94 = 5257. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 49 × 80 = 3925. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 53 × 78 = 4134. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 940 + 497 = 1437. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 78 × 21 = 1638. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 382 + 767 = 1156. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 88 × 75 = 6600. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 59 × 24 = 1416. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 88 × 19 = 1672. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 21 × 28 = 588. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 27 × 64 = 1728. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 31 × 57 = 1773. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 86 × 16 = 1376. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 725 + 973 = 1696. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 43 × 24 = 1037. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 538 + 338 = 876. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 706 + 707 = 1413. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 847 + 803 = 1650. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 28 × 74 = 2072. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 76 × 53 = 4028. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 226 + 386 = 612. Correct or wrong? (a) wrong (b) correct

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