Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 47 · 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: 33 × 32 = 1050. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 239 + 774 = 1020. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 46 × 13 = 593. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 571 + 427 = 1006. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 50 × 41 = 2049. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 76 × 21 = 1596. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 702 + 890 = 1594. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 33 × 30 = 990. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 238 + 856 = 1094. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 74 × 50 = 3700. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 924 + 795 = 1724. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 950 + 553 = 1497. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 15 × 45 = 675. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 29 × 31 = 899. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 94 × 76 = 7138. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 70 × 67 = 4690. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 183 + 396 = 579. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 643 + 490 = 1133. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 50 × 21 = 1050. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 361 + 190 = 552. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 22 × 99 = 2185. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 637 + 758 = 1395. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 884 + 216 = 1103. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 411 + 950 = 1361. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 800 + 419 = 1219. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 45 × 88 = 3960. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 94 × 19 = 1793. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 678 + 417 = 1095. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 98 × 27 = 2646. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 30 × 60 = 1800. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 851 + 561 = 1412. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 36 × 94 = 3383. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 91 × 28 = 2548. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 501 + 147 = 648. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 77 × 98 = 7546. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 15 × 99 = 1482. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 88 × 78 = 6864. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 859 + 774 = 1638. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 56 × 81 = 4536. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 341 + 611 = 952. Correct or wrong? (a) wrong (b) correct

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