Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 213 · 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: 57 × 30 = 1710. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 913 + 260 = 1173. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 53 × 69 = 3664. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 460 + 992 = 1456. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 49 × 35 = 1721. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 614 + 375 = 989. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 81 × 26 = 2104. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 338 + 194 = 532. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 30 × 99 = 2969. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 920 + 194 = 1122. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 142 + 908 = 1050. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 27 × 33 = 890. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 88 × 54 = 4755. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 92 × 23 = 2116. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 385 + 746 = 1137. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 295 + 617 = 915. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 305 + 886 = 1184. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 35 × 27 = 951. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 29 × 80 = 2313. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 31 × 54 = 1673. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 886 + 853 = 1737. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 21 × 15 = 307. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 17 × 21 = 357. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 712 + 199 = 905. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 83 × 92 = 7631. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 663 + 359 = 1022. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 861 + 879 = 1740. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 98 × 60 = 5884. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 642 + 529 = 1171. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 14 × 79 = 1113. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 269 + 505 = 774. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 15 × 26 = 389. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 14 × 19 = 266. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 21 × 35 = 735. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 737 + 141 = 878. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 492 + 915 = 1407. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 194 + 408 = 607. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 49 × 91 = 4452. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 40 × 28 = 1114. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 32 × 32 = 1024. Correct or wrong? (a) correct (b) wrong

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