Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 756 · 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: 246 + 124 = 362. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 79 × 64 = 5056. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 40 × 73 = 2920. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 78 × 65 = 5070. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 169 + 527 = 696. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 404 + 691 = 1100. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 71 × 40 = 2845. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 228 + 599 = 823. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 66 × 47 = 3102. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 84 × 98 = 8234. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 24 × 45 = 1076. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 86 × 89 = 7654. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 33 × 76 = 2508. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 46 × 38 = 1741. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 82 × 96 = 7874. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 446 + 283 = 729. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 142 + 847 = 986. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 32 × 30 = 960. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 922 + 994 = 1916. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 26 × 96 = 2496. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 424 + 510 = 934. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 278 + 579 = 850. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 811 + 801 = 1615. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 98 × 95 = 9309. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 41 × 50 = 2050. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 67 × 12 = 802. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 352 + 211 = 564. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 322 + 795 = 1118. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 94 × 60 = 5640. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 32 × 96 = 3077. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 36 × 13 = 468. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 71 × 24 = 1704. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 654 + 166 = 820. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 39 × 42 = 1638. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 581 + 243 = 818. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 49 × 97 = 4746. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 875 + 576 = 1446. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 37 × 13 = 485. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 320 + 279 = 599. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 260 + 620 = 884. Correct or wrong? (a) correct (b) wrong

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