Suppose that you made a cake, and you want to give of the cake to your friend, but then you learn that your friend took of the cake. So, did your friend take more, less, or the exact amount that you wanted to give him? We can draw both fractions:
By looking at the figure, it seems that both fractions are the same, but is this the case? We need a better way to compare these fractions.
There are two ways to compare these fractions:
I. Find a Common Denominator
To find the answer, we can compare the numerators for both fractions by converting their denominators to the same value.
Are and the same or is one greater
First multiply the values on one side by the denominator on the opposite side
Now that both denominators are the same, compare numerators
From here we can see that 3/5(or 21/35) > 4/7(or 20/35) since 21 > 20
II. Convert Fractions to Decimals
In the example above divide the numerator by the denominator
3 5 ? 4 7
Compare both values
So, now you know that your friend did not take as much cake as you wanted to give him.
Try it yourself
Order the following fractions from least to greatest.
3.) 1 3
Insert <, > or = to make to the following statements true.
5.) 2 ___ 3
6.) ___ 3