Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 244 · 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: 321 + 167 = 494. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 72 × 90 = 6480. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 35 × 27 = 944. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 69 × 62 = 4278. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 25 × 29 = 725. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 951 + 251 = 1202. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 43 × 56 = 2409. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 991 + 726 = 1718. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 876 + 843 = 1719. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 54 × 36 = 1944. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 39 × 92 = 3588. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 790 + 483 = 1274. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 30 × 36 = 1080. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 236 + 328 = 564. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 947 + 368 = 1309. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 244 + 694 = 938. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 75 × 20 = 1492. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 496 + 319 = 816. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 92 × 93 = 8549. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 13 × 30 = 396. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 988 + 299 = 1287. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 66 × 59 = 3900. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 17 × 69 = 1173. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 95 × 60 = 5693. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 30 × 90 = 2695. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 709 + 878 = 1586. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 13 × 25 = 325. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 22 × 52 = 1148. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 39 × 27 = 1045. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 77 × 15 = 1163. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 83 × 24 = 1999. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 436 + 324 = 760. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 68 × 86 = 5848. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 303 + 160 = 463. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 61 × 30 = 1822. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 26 × 20 = 520. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 21 × 87 = 1827. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 34 × 30 = 1020. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 413 + 644 = 1057. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 283 + 823 = 1107. Correct or wrong? (a) wrong (b) correct

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