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Posted by on Monday, December 14, 2009 at 5:21pm.

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.

  • Fifth Grade Math - , Monday, December 14, 2009 at 5:28pm

    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

  • Fifth Grade Math - , Monday, December 14, 2009 at 5:31pm

    You can set up a ratio and cross-multiply:
    http://www.worldplenty.com/rat.htm

    7/10 = 175104000/x

    Cross-multiply and solve for x.

  • Fifth Grade Math - , Wednesday, November 9, 2011 at 5:13pm

    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!!

  • Fifth Grade Math - , Monday, September 17, 2012 at 10:14pm

    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!

  • Fifth Grade Math - , Tuesday, October 30, 2012 at 7:06pm

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

  • are you ms. sue teacher in texas - , Tuesday, October 8, 2013 at 10:28pm

    are you ms. sue teacher in texas

  • Fifth Grade Math - , Tuesday, October 20, 2015 at 8:34pm

    nuts

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