Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 628 · 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: 421 + 633 = 1054. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 62 × 73 = 4526. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 88 × 79 = 6949. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 939 + 905 = 1844. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 84 × 17 = 1431. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 35 × 82 = 2870. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 22 × 43 = 946. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 527 + 241 = 760. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 69 × 78 = 5382. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 86 × 49 = 4214. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 909 + 984 = 1887. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 90 × 49 = 4410. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 92 × 21 = 1932. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 12 × 32 = 384. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 235 + 672 = 913. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 580 + 364 = 952. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 15 × 77 = 1163. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 255 + 897 = 1152. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 12 × 58 = 698. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 958 + 603 = 1561. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 65 × 58 = 3770. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 65 × 21 = 1365. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 88 × 91 = 8000. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 36 × 67 = 2417. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 46 × 25 = 1154. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 884 + 207 = 1091. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 80 × 97 = 7760. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 65 × 39 = 2536. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 285 + 953 = 1236. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 14 × 68 = 951. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 32 × 15 = 480. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 967 + 248 = 1214. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 96 × 31 = 2976. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 21 × 37 = 771. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 159 + 389 = 550. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 64 × 25 = 1600. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 315 + 515 = 830. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 965 + 333 = 1298. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 740 + 347 = 1087. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 49 × 75 = 3667. Correct or wrong? (a) wrong (b) correct

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