How can you compare 2 fractions by using a number

I don't know what you're asking here but maybe this is referring to ratios. For example:

1/2 and 3/2 have a ratio of 1:3

Or you could say 3/2 is 3 times greater than 1/2. You're comparing the two fractions with the number '3'. Maybe if you clarify your question I could be more helpful.

To compare two fractions using a number, you need to convert both fractions to a common denominator. Once the fractions have the same denominator, you can compare them by comparing their numerators.

Here's how you can compare two fractions using a number:

1. Identify the fractions you want to compare. For example, let's say we want to compare 1/4 and 3/8.

2. Determine a common denominator for both fractions. The common denominator is the least common multiple (LCM) of the denominators. In this example, the LCM of 4 and 8 is 8.

3. Convert both fractions to have the common denominator. To do this, you need to multiply the numerator and denominator of each fraction by the same number so that the denominators become the common denominator (8 in this example).

- For 1/4: Multiply both the numerator and denominator by 2, giving you 2/8.
- For 3/8: No conversion is needed since the denominator is already 8.

4. Compare the numerators of the converted fractions. In this example, the numerators are 2 and 3. Since 3 is greater than 2, we can say that 3/8 is greater than 1/4.

So using the number 8 as the common denominator, we compared 1/4 and 3/8 and determined that 3/8 is greater.