Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 865 · 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: 79 × 39 = 3080. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 15 × 83 = 1245. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 326 + 129 = 451. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 50 × 57 = 2850. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 230 + 301 = 538. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 266 + 158 = 427. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 345 + 311 = 662. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 19 × 26 = 498. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 839 + 872 = 1711. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 70 × 15 = 1047. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 18 × 20 = 360. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 84 × 45 = 3780. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 700 + 279 = 979. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 943 + 966 = 1909. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 678 + 299 = 977. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 358 + 962 = 1315. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 51 × 39 = 1989. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 136 + 564 = 700. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 72 × 80 = 5764. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 29 × 70 = 2029. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 97 × 77 = 7473. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 967 + 854 = 1819. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 124 + 558 = 682. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 75 × 34 = 2544. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 872 + 502 = 1374. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 526 + 663 = 1195. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 758 + 128 = 886. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 625 + 440 = 1069. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 24 × 14 = 339. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 144 + 407 = 545. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 699 + 363 = 1062. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 67 × 23 = 1541. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 67 × 42 = 2806. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 193 + 982 = 1175. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 360 + 371 = 728. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 49 × 67 = 3283. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 83 × 82 = 6806. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 75 × 39 = 2929. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 66 × 40 = 2640. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 61 × 27 = 1647. Correct or wrong? (a) correct (b) wrong

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