Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 423 · 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: 239 + 577 = 816. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 95 × 90 = 8550. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 24 × 67 = 1608. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 52 × 84 = 4368. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 90 × 82 = 7380. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 596 + 404 = 1000. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 65 × 93 = 6039. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 26 × 72 = 1871. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 309 + 286 = 595. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 261 + 431 = 692. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 27 × 83 = 2243. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 90 × 19 = 1711. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 933 + 757 = 1694. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 16 × 62 = 990. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 270 + 488 = 757. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 25 × 17 = 430. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 843 + 609 = 1452. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 78 × 38 = 2964. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 95 × 51 = 4838. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 203 + 480 = 683. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 300 + 354 = 654. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 408 + 174 = 579. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 650 + 954 = 1604. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 65 × 95 = 6175. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 53 × 54 = 2862. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 399 + 584 = 983. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 78 × 33 = 2580. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 87 × 73 = 6355. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 15 × 69 = 1035. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 852 + 137 = 996. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 691 + 121 = 812. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 612 + 713 = 1331. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 50 × 12 = 600. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 693 + 530 = 1223. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 24 × 27 = 648. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 13 × 46 = 598. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 95 × 83 = 7882. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 437 + 811 = 1248. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 45 × 57 = 2565. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 994 + 551 = 1545. Correct or wrong? (a) wrong (b) correct

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