Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 78 · 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: 976 + 349 = 1325. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 510 + 788 = 1290. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 297 + 560 = 852. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 730 + 776 = 1506. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 172 + 691 = 858. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 30 × 41 = 1230. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 79 × 60 = 4733. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 56 × 16 = 898. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 381 + 200 = 587. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 49 × 40 = 1960. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 22 × 19 = 418. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 82 × 61 = 5002. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 59 × 33 = 1943. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 92 × 51 = 4700. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 85 × 13 = 1105. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 667 + 753 = 1422. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 64 × 46 = 2944. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 221 + 602 = 823. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 14 × 27 = 378. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 604 + 946 = 1554. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 36 × 69 = 2486. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 476 + 222 = 698. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 60 × 79 = 4734. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 63 × 54 = 3410. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 74 × 78 = 5766. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 48 × 62 = 2976. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 41 × 39 = 1607. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 48 × 35 = 1675. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 382 + 955 = 1338. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 486 + 300 = 785. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 592 + 637 = 1234. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 27 × 87 = 2349. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 29 × 80 = 2320. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 29 × 80 = 2320. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 452 + 433 = 891. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 382 + 692 = 1074. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 40 × 20 = 799. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 21 × 46 = 966. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 359 + 164 = 523. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 22 × 79 = 1738. Correct or wrong? (a) wrong (b) correct

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