Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 780 · 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: 506 + 936 = 1448. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 27 × 51 = 1377. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 58 × 90 = 5220. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 351 + 361 = 717. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 33 × 57 = 1881. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 99 × 40 = 3960. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 30 × 79 = 2370. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 17 × 24 = 404. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 47 × 63 = 2965. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 60 × 59 = 3537. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 93 × 84 = 7807. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 27 × 83 = 2241. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 716 + 127 = 843. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 35 × 82 = 2870. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 37 × 93 = 3433. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 35 × 36 = 1262. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 46 × 30 = 1380. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 66 × 80 = 5285. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 916 + 929 = 1848. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 36 × 69 = 2479. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 55 × 54 = 2970. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 161 + 795 = 956. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 87 × 36 = 3131. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 626 + 929 = 1557. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 62 × 99 = 6138. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 867 + 259 = 1126. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 26 × 18 = 468. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 604 + 325 = 929. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 48 × 19 = 912. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 96 × 29 = 2789. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 87 × 77 = 6694. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 53 × 34 = 1810. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 35 × 15 = 527. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 180 + 155 = 331. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 51 × 42 = 2141. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 982 + 680 = 1662. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 977 + 859 = 1840. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 54 × 83 = 4478. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 46 × 87 = 3994. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 274 + 790 = 1064. Correct or wrong? (a) correct (b) wrong

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