Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 602 · 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: 17 × 37 = 629. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 98 × 56 = 5488. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 869 + 620 = 1489. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 34 × 91 = 3094. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 644 + 926 = 1570. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 77 × 91 = 7007. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 72 × 14 = 1016. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 28 × 34 = 947. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 41 × 26 = 1066. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 880 + 863 = 1743. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 65 × 35 = 2274. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 35 × 24 = 835. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 77 × 60 = 4620. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 684 + 731 = 1414. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 69 × 62 = 4273. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 334 + 499 = 833. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 76 × 34 = 2584. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 89 × 82 = 7290. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 968 + 172 = 1134. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 603 + 211 = 814. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 59 × 94 = 5546. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 906 + 601 = 1507. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 892 + 567 = 1459. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 27 × 31 = 845. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 803 + 886 = 1689. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 47 × 56 = 2632. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 21 × 57 = 1204. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 32 × 74 = 2369. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 177 + 555 = 732. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 69 × 77 = 5311. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 20 × 59 = 1176. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 606 + 513 = 1118. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 304 + 276 = 580. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 16 × 22 = 352. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 27 × 51 = 1379. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 913 + 919 = 1832. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 80 × 96 = 7680. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 64 × 53 = 3390. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 59 × 79 = 4661. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 792 + 399 = 1191. Correct or wrong? (a) correct (b) wrong

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