Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 570 · 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: 84 × 94 = 7896. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 818 + 720 = 1541. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 698 + 760 = 1463. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 947 + 400 = 1347. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 55 × 23 = 1263. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 147 + 149 = 292. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 184 + 316 = 507. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 135 + 835 = 968. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 688 + 212 = 900. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 42 × 14 = 588. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 14 × 23 = 322. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 61 × 97 = 5917. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 33 × 47 = 1551. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 32 × 72 = 2304. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 165 + 900 = 1068. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 12 × 85 = 1018. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 79 × 27 = 2133. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 53 × 81 = 4293. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 24 × 72 = 1728. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 600 + 850 = 1452. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 81 × 73 = 5911. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 642 + 438 = 1080. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 291 + 406 = 697. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 770 + 963 = 1733. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 378 + 809 = 1188. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 29 × 31 = 898. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 88 × 91 = 8008. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 233 + 867 = 1100. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 40 × 67 = 2674. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 17 × 97 = 1644. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 423 + 983 = 1406. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 65 × 63 = 4088. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 28 × 89 = 2497. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 58 × 68 = 3947. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 986 + 948 = 1934. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 78 × 12 = 936. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 756 + 984 = 1747. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 63 × 24 = 1520. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 343 + 698 = 1044. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 325 + 664 = 989. Correct or wrong? (a) correct (b) wrong

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