Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 705 · 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: 32 × 84 = 2692. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 417 + 858 = 1275. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 62 × 94 = 5825. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 889 + 715 = 1602. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 69 × 26 = 1794. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 35 × 53 = 1855. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 12 × 92 = 1104. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 886 + 711 = 1595. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 24 × 49 = 1177. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 198 + 500 = 698. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 375 + 123 = 498. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 45 × 22 = 996. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 29 × 48 = 1397. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 391 + 725 = 1116. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 147 + 356 = 501. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 94 × 65 = 6110. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 55 × 41 = 2255. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 24 × 70 = 1680. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 17 × 92 = 1556. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 74 × 20 = 1477. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 85 × 45 = 3818. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 48 × 56 = 2685. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 354 + 211 = 565. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 33 × 57 = 1880. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 58 × 54 = 3132. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 35 × 48 = 1679. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 87 × 48 = 4176. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 56 × 21 = 1176. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 685 + 373 = 1052. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 312 + 289 = 603. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 737 + 381 = 1119. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 910 + 695 = 1605. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 57 × 37 = 2109. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 89 × 50 = 4450. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 755 + 332 = 1087. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 987 + 291 = 1285. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 404 + 841 = 1245. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 26 × 38 = 994. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 816 + 433 = 1250. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 328 + 361 = 682. Correct or wrong? (a) wrong (b) correct

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