Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 194 · 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: 76 × 76 = 5772. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 604 + 345 = 949. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 494 + 784 = 1278. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 55 × 34 = 1874. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 604 + 983 = 1587. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 754 + 787 = 1541. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 283 + 775 = 1058. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 31 × 54 = 1674. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 68 × 94 = 6392. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 917 + 733 = 1650. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 383 + 218 = 599. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 84 × 88 = 7392. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 267 + 326 = 593. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 67 × 69 = 4617. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 324 + 262 = 586. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 55 × 87 = 4785. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 14 × 65 = 906. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 32 × 25 = 800. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 19 × 13 = 245. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 801 + 854 = 1653. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 78 × 51 = 3977. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 86 × 63 = 5418. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 965 + 984 = 1949. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 926 + 203 = 1127. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 334 + 485 = 819. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 726 + 465 = 1191. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 30 × 51 = 1530. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 218 + 994 = 1212. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 98 × 12 = 1177. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 86 × 47 = 4040. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 54 × 49 = 2646. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 68 × 84 = 5708. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 38 × 22 = 841. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 487 + 189 = 671. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 533 + 334 = 867. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 14 × 94 = 1316. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 61 × 61 = 3721. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 17 × 35 = 600. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 303 + 764 = 1067. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 98 × 30 = 2932. Correct or wrong? (a) wrong (b) correct

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