Preston is making cookies. He has 4 over 5 cup of flour in a bag. He then used two 1 over 10 cups of flour for his recipe. Which of the following best explains the amount of flour left in the bag?

I know that you need to use subtracting.

you also need the make the denominators the same.

Find what the LCM for both numbers 5 and 10.

5: 5, 10, 15

10: 10,20,30

Both have 10 and common.

Do 4/5 x 2/2 and you get 8/10.

Then do 2 1/10 x 1/1 and you get 2 1/10.

then subtract 8/10 by 2 1/10.

You will get 2 7/10 as your answer.