Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 930 · 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: 67 × 74 = 4958. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 469 + 591 = 1060. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 175 + 330 = 513. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 57 × 34 = 1938. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 82 × 61 = 5002. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 56 × 34 = 1904. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 13 × 82 = 1063. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 70 × 25 = 1755. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 49 × 42 = 2058. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 504 + 120 = 624. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 267 + 468 = 735. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 465 + 966 = 1431. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 90 × 58 = 5220. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 41 × 62 = 2542. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 328 + 307 = 635. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 28 × 13 = 360. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 62 × 34 = 2111. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 72 × 40 = 2873. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 868 + 895 = 1763. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 800 + 960 = 1766. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 675 + 438 = 1108. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 68 × 52 = 3539. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 989 + 760 = 1748. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 732 + 798 = 1537. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 958 + 910 = 1868. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 42 × 71 = 2982. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 283 + 480 = 763. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 98 × 86 = 8433. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 37 × 62 = 2295. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 24 × 20 = 480. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 36 × 64 = 2307. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 15 × 91 = 1365. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 665 + 513 = 1179. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 377 + 362 = 734. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 544 + 348 = 888. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 52 × 21 = 1092. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 50 × 82 = 4100. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 41 × 94 = 3847. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 695 + 880 = 1575. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 77 × 55 = 4235. Correct or wrong? (a) correct (b) wrong

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