Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 517 · 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: 59 × 21 = 1239. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 96 × 48 = 4609. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 735 + 691 = 1433. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 452 + 475 = 927. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 140 + 983 = 1123. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 98 × 32 = 3142. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 56 × 85 = 4767. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 888 + 259 = 1147. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 321 + 194 = 518. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 46 × 63 = 2898. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 670 + 539 = 1209. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 245 + 812 = 1064. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 917 + 384 = 1298. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 43 × 19 = 812. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 839 + 295 = 1134. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 703 + 335 = 1031. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 175 + 138 = 313. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 99 × 44 = 4356. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 451 + 697 = 1148. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 913 + 418 = 1331. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 93 × 23 = 2138. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 12 × 55 = 654. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 20 × 94 = 1880. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 878 + 301 = 1175. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 73 × 93 = 6784. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 24 × 43 = 1032. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 29 × 35 = 1015. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 89 × 13 = 1151. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 626 + 912 = 1531. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 83 × 13 = 1072. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 597 + 700 = 1297. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 664 + 252 = 916. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 523 + 965 = 1481. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 36 × 58 = 2088. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 198 + 300 = 498. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 147 + 916 = 1063. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 30 × 45 = 1346. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 73 × 79 = 5761. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 511 + 510 = 1021. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 902 + 674 = 1576. Correct or wrong? (a) correct (b) wrong

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