Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 13 · 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: 50 × 85 = 4256. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 77 × 44 = 3382. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 30 × 44 = 1328. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 44 × 41 = 1804. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 59 × 35 = 2066. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 585 + 197 = 777. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 348 + 464 = 810. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 62 × 19 = 1178. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 99 × 39 = 3857. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 65 × 99 = 6435. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 214 + 255 = 469. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 515 + 306 = 821. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 87 × 85 = 7395. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 50 × 13 = 645. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 930 + 205 = 1135. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 16 × 15 = 247. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 185 + 869 = 1061. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 467 + 475 = 944. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 318 + 231 = 542. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 83 × 32 = 2664. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 15 × 20 = 303. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 28 × 44 = 1232. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 20 × 71 = 1413. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 90 × 43 = 3870. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 35 × 19 = 671. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 656 + 625 = 1281. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 707 + 460 = 1167. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 575 + 272 = 852. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 96 × 56 = 5370. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 744 + 260 = 1005. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 159 + 607 = 765. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 475 + 733 = 1204. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 28 × 54 = 1519. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 65 × 13 = 845. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 57 × 16 = 910. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 262 + 697 = 960. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 17 × 50 = 850. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 93 × 59 = 5492. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 23 × 73 = 1672. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 583 + 206 = 785. Correct or wrong? (a) correct (b) wrong

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