Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 183 · 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: 565 + 130 = 694. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 60 × 31 = 1860. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 37 × 52 = 1925. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 87 × 41 = 3567. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 56 × 57 = 3200. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 540 + 870 = 1418. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 475 + 371 = 846. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 349 + 865 = 1222. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 56 × 62 = 3472. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 75 × 57 = 4275. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 814 + 440 = 1254. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 761 + 211 = 972. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 91 × 48 = 4370. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 85 × 93 = 7900. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 282 + 298 = 580. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 360 + 375 = 735. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 48 × 91 = 4367. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 74 × 36 = 2663. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 121 + 334 = 455. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 431 + 969 = 1400. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 39 × 70 = 2725. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 43 × 50 = 2150. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 66 × 37 = 2450. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 925 + 831 = 1756. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 270 + 874 = 1138. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 569 + 530 = 1099. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 890 + 444 = 1336. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 947 + 828 = 1775. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 413 + 591 = 1011. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 49 × 57 = 2793. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 124 + 226 = 350. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 37 × 47 = 1739. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 77 × 90 = 6930. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 86 × 41 = 3526. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 15 × 62 = 929. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 25 × 31 = 783. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 164 + 493 = 657. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 871 + 709 = 1580. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 67 × 79 = 5293. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 495 + 933 = 1428. Correct or wrong? (a) wrong (b) correct

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