Fifth Grade Math
posted by Tiffany T on .
How do you explain how to do this math problem to a child?
7/10 of the U.S. population (175,104,000)in 1991 believed saying A to be true. What is the total population? We are trying to find what the whole population total is. They have given us 7/10 or 1755,104,00. How do we get the whole? Thanks.

7/10 times an unknown number can be written as (7/10)x
(7/10)x = 175,104,000
Divide 175,104,000 by 7/10
175,104,000 / 7/10 = 175,104,000 * 10/7
1,751,040,000 / 7 = 250,148,571 
You can set up a ratio and crossmultiply:
http://www.worldplenty.com/rat.htm
7/10 = 175104000/x
Crossmultiply and solve for x. 
IDK EVEN HAVE A CLUE!!! I AM ALSO A FIFTH GRADER AND I LOOKED ONLINE TO SEE THE ANSWER AND THATS HOW I GOT HERE!!

Thank you! I was leading my child on another route! I still don't get it but shucks, she was closer to it than me. She was gonna multiply instead of divide. Ugh!

This is soooo helpful I had no idea how to do this

are you ms. sue teacher in texas

nuts