Discussion
Which one of the following fractions is greatest?
*This question is included in Nova Math - Problem Set O: Fractions & Decimals, question #2
| (A) | 5/6 |
| (B) | ... |
| (C) | ... |
| (D) | ... |
| (E) | ... |
| (F) | ... |
The solution is
Posted: 08/27/2012 08:41
When cross multiplying to compare 2 fractions, how do you attribute 25 to 5/6 and 24 to 4/5?
Posted: 08/27/2012 08:42
When cross multiplying to compare 2 fractions, why do you attribute 25 to 5/6 and 24 to 4/5?
Posted: 08/27/2012 13:37
Alissa, to answer your question, we must understand the logic behind cross multiplying to compare 2 fractions. All we are doing in comparative cross-multiplication is multiplying both fractions with the least common multiple of the denominators. Since you are comparing 5/6 and 4/5, the least common multiple of 6 and 5 is 30.
Multiplying 5/6 by 30 = 5 * 5 = 25
Multiplying 4/5 by 30 = 4 * 6 = 24
Multiplying 5/6 by 30 = 5 * 5 = 25
Multiplying 4/5 by 30 = 4 * 6 = 24