# basic math

posted by .

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 don't 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.

## Similar Questions

1. ### Algebra

Here is the problem: You are going to make ans sell bread. A loaf of Irish soda bread is made with 2 cups flour and 1/4 cup sugar. Banana bread is made with 4 cups flour and 1 cup of sugar. You will make a profit of \$1.50 on each loaf …
2. ### Math

Here is the question: "To make a pancake mix, add 1/2 cup of sugar, 3 cups of flour, 1 cup of powdered milk, 1 teaspoon baking powder and 1/2 teaspoon salt. Assuming the volume of the baking powder and salt are negligible, how much …
3. ### math

jeanine used 2 1/2 cups of flour to make muffins and 1 3/4 cups of flour to make biscuits. after bortowing 1/4 cup of flour, she had 2 1/4 cups left to make bread. how much flour did she have to begin with?
4. ### algebra

a bread recipe calls for 2/3 cup of rye flour. you only have 3/4 cup on hand. what percent of your original amount of rye flour will remain after baking the bread?
5. ### math

A recipe calls for 1 1/3 cups of flour. Harold has 1/2 cup of flour. How much more flour does Harold need to make the recipe?
6. ### math 2

Ben is making a bread that calls for 5 cups of flour. He only has 1/2 cup measuring cup. How many times will Ben need to fill the 1/2 cup measuring cup to get the 5 cups of flour?
7. ### Math

A cook has 2 2/3 cups of flour. A recipe calls for 2 3/4 cups of flour. Does the cook have enough flour?
8. ### Math

Ben is making a bread that calls for 5 cups of flour.He only has a cup 1/2-cup measuring cup.how many times will Ben need to fill the 1/2-cup measuring cup to get the 5 cups of flour?
9. ### Math

Jeanine used 21/2 cups of flour to make muffins and 1 3/4 cups of flour to make biscuits. After borrowing 1/4 cup of flour,she had 2 1/4 cups left to make bread. How much flour did she have to begin with?
10. ### Math

A recipe that makes 10 mini loaves of banana bread calls for 1 1/4 cups flour. How much flour is needed to make 2 dozen

More Similar Questions