Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 972 · 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 × 65 = 3705. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 54 × 82 = 4434. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 57 × 55 = 3135. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 505 + 704 = 1209. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 82 × 82 = 6718. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 941 + 175 = 1116. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 16 × 94 = 1512. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 30 × 74 = 2227. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 20 × 21 = 420. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 96 × 38 = 3644. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 496 + 196 = 689. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 75 × 19 = 1425. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 45 × 32 = 1439. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 62 × 95 = 5890. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 737 + 868 = 1612. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 468 + 291 = 759. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 370 + 287 = 657. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 68 × 30 = 2040. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 59 × 13 = 767. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 708 + 520 = 1228. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 580 + 298 = 878. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 40 × 94 = 3761. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 44 × 97 = 4268. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 360 + 783 = 1141. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 928 + 843 = 1765. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 54 × 98 = 5292. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 862 + 192 = 1046. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 56 × 75 = 4200. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 825 + 992 = 1817. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 28 × 56 = 1574. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 25 × 75 = 1875. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 37 × 78 = 2893. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 87 × 16 = 1385. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 874 + 234 = 1106. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 896 + 665 = 1560. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 19 × 25 = 475. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 50 × 77 = 3850. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 25 × 83 = 2083. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 939 + 173 = 1120. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 352 + 473 = 825. Correct or wrong? (a) wrong (b) correct

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