Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 1 · 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: 689 + 290 = 983. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 31 × 98 = 3036. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 431 + 730 = 1161. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 53 × 59 = 3128. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 36 × 23 = 834. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 671 + 164 = 835. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 65 × 61 = 3968. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 803 + 391 = 1194. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 19 × 92 = 1740. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 97 × 22 = 2134. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 130 + 339 = 471. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 794 + 660 = 1451. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 528 + 291 = 819. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 53 × 58 = 3072. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 142 + 906 = 1044. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 538 + 447 = 985. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 33 × 64 = 2112. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 37 × 32 = 1179. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 97 × 56 = 5435. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 52 × 35 = 1820. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 425 + 592 = 1017. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 135 + 698 = 836. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 94 × 84 = 7904. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 159 + 148 = 303. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 344 + 485 = 829. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 67 × 35 = 2345. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 144 + 257 = 395. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 326 + 271 = 597. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 62 × 47 = 2914. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 22 × 82 = 1803. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 450 + 987 = 1437. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 24 × 74 = 1776. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 251 + 158 = 409. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 32 × 59 = 1888. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 74 × 79 = 5846. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 191 + 777 = 968. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 90 × 27 = 2430. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 82 × 34 = 2788. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 58 × 49 = 2842. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 646 + 983 = 1629. Correct or wrong? (a) correct (b) wrong

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