Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 143 · 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: 37 × 56 = 2072. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 290 + 300 = 585. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 69 × 35 = 2421. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 140 + 837 = 977. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 12 × 83 = 996. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 71 × 59 = 4189. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 133 + 994 = 1135. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 22 × 24 = 533. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 598 + 806 = 1404. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 530 + 869 = 1402. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 94 × 63 = 5917. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 34 × 42 = 1428. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 72 × 92 = 6632. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 954 + 427 = 1381. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 396 + 279 = 675. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 325 + 375 = 700. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 40 × 42 = 1680. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 89 × 68 = 6052. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 39 × 34 = 1334. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 42 × 43 = 1806. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 251 + 858 = 1109. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 35 × 45 = 1575. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 146 + 720 = 862. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 32 × 97 = 3101. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 17 × 70 = 1188. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 30 × 30 = 900. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 91 × 31 = 2821. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 88 × 12 = 1061. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 204 + 929 = 1133. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 358 + 753 = 1111. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 82 × 47 = 3854. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 13 × 38 = 494. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 987 + 917 = 1904. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 90 × 76 = 6840. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 72 × 34 = 2446. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 310 + 180 = 485. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 167 + 761 = 920. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 152 + 140 = 292. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 209 + 349 = 553. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 62 × 44 = 2727. Correct or wrong? (a) wrong (b) correct

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