Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 145 · 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: 70 × 21 = 1467. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 242 + 253 = 495. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 81 × 32 = 2592. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 679 + 159 = 843. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 69 × 45 = 3105. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 425 + 798 = 1223. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 288 + 544 = 832. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 34 × 92 = 3124. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 33 × 79 = 2600. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 821 + 457 = 1282. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 226 + 218 = 446. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 32 × 25 = 795. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 878 + 350 = 1228. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 22 × 32 = 704. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 234 + 790 = 1024. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 362 + 521 = 875. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 141 + 861 = 1002. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 318 + 263 = 585. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 63 × 80 = 5040. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 232 + 444 = 684. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 44 × 87 = 3823. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 55 × 67 = 3685. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 39 × 71 = 2769. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 701 + 642 = 1343. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 684 + 371 = 1055. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 704 + 719 = 1423. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 44 × 55 = 2420. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 31 × 29 = 899. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 79 × 55 = 4345. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 443 + 635 = 1075. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 44 × 37 = 1628. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 819 + 661 = 1475. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 12 × 72 = 864. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 46 × 50 = 2300. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 762 + 639 = 1401. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 89 × 29 = 2573. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 196 + 612 = 808. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 177 + 832 = 1005. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 85 × 75 = 6374. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 61 × 61 = 3721. Correct or wrong? (a) wrong (b) correct

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