Posted by **chrissy** on Monday, August 6, 2007 at 10:13pm.

In my book

A bread piece calls for 3 1/4 cups of flour if you only have 2 1/8 cup. How much more flour is needed?

3 1/4 -2 1/8= 13/4 - 17/9 how does it equal 13/4 can someone show me that part? I thought I knew how to subtract fractions but I dont get it.

3 1/4 - 2 1/8 = 13/4 - 17/8 =

26/8 - 17/8 = 9/8 = 1 1/8

All you do is multiply the whole number by the denominator and then add the numerator: 3 x 4 + 1 = 13. Then put the 13 over 4, and you have changed the mixed number to a improper fraction that can be used in an addition or subtraction problem.

How will you convert the second mixed number in the problem? (Hint: 17/9 is not correct.)

Then, before you can subtract (or add) fractions, you have to convert them so they have common denominators. The obvious common denominator between ?/4 and ?/8 is 8, so that's not a problem; just convert the first fraction so the demoninator is 8.

http://www.themathpage.com/ARITH/fractions.htm
Let me know what you come up with.

=)

ok durr i think i just had a brain fart or something thanks.

## Answer this Question

## Related Questions

- Math - Jeanine used 21/2 cups of flour to make muffins and 1 3/4 cups of flour ...
- math - jeanine used 2 1/2 cups of flour to make muffins and 1 3/4 cups of flour ...
- Math - A cook has 2 2/3 cups of flour. A recipe calls for 2 3/4 cups of flour. ...
- Math - Ben is making a bread that calls for 5 cups of flour.He only has a cup 1/...
- math 2 - Ben is making a bread that calls for 5 cups of flour. He only has 1/2 ...
- algebra - a bread recipe calls for 2/3 cup of rye flour. you only have 3/4 cup ...
- Math - Here is the question: "To make a pancake mix, add 1/2 cup of sugar, 3 ...
- math - A recipe calls for 1 1/3 cups of flour. Harold has 1/2 cup of flour. How ...
- Algebra - Here is the problem: You are going to make ans sell bread. A loaf of ...
- Math - Amy uses 8 cups of flour to make 3 identical loaves of bread.How much ...

More Related Questions