Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 511 · 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: 930 + 549 = 1478. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 45 × 64 = 2880. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 567 + 828 = 1395. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 341 + 735 = 1076. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 662 + 326 = 983. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 86 × 70 = 6020. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 75 × 12 = 901. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 21 × 84 = 1767. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 307 + 768 = 1071. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 18 × 63 = 1134. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 956 + 836 = 1792. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 194 + 568 = 759. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 12 × 34 = 408. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 32 × 24 = 768. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 481 + 942 = 1423. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 351 + 579 = 930. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 29 × 79 = 2291. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 12 × 84 = 1008. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 46 × 20 = 925. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 98 × 93 = 9119. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 790 + 216 = 1006. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 623 + 941 = 1563. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 35 × 58 = 2029. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 697 + 186 = 875. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 64 × 24 = 1534. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 649 + 978 = 1627. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 84 × 37 = 3108. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 314 + 956 = 1270. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 231 + 284 = 515. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 400 + 141 = 541. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 72 × 24 = 1728. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 24 × 83 = 2000. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 543 + 806 = 1349. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 32 × 71 = 2272. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 62 × 22 = 1364. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 323 + 353 = 678. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 893 + 295 = 1188. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 46 × 17 = 782. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 66 × 91 = 6006. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 22 × 26 = 572. Correct or wrong? (a) correct (b) wrong

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