Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 45 · 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: 78 × 33 = 2574. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 42 × 87 = 3660. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 14 × 13 = 182. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 61 × 92 = 5612. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 720 + 873 = 1596. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 277 + 876 = 1152. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 49 × 26 = 1271. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 16 × 77 = 1240. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 99 × 17 = 1688. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 428 + 822 = 1252. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 80 × 91 = 7280. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 298 + 859 = 1157. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 741 + 849 = 1590. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 95 × 31 = 2947. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 540 + 550 = 1090. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 331 + 832 = 1163. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 217 + 342 = 559. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 942 + 214 = 1156. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 995 + 301 = 1298. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 84 × 83 = 6972. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 610 + 786 = 1396. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 72 × 61 = 4391. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 759 + 874 = 1633. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 52 × 45 = 2345. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 39 × 94 = 3666. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 22 × 94 = 2068. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 44 × 44 = 1936. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 264 + 334 = 593. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 25 × 14 = 353. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 28 × 22 = 617. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 568 + 625 = 1189. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 146 + 786 = 932. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 82 × 69 = 5658. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 44 × 56 = 2459. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 45 × 17 = 765. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 14 × 81 = 1131. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 94 × 36 = 3384. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 73 × 31 = 2269. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 82 × 93 = 7629. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 758 + 181 = 933. Correct or wrong? (a) wrong (b) correct

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