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 cross-multiply:
http://www.worldplenty.com/rat.htm
7/10 = 175104000/x
Cross-multiply 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
To find the total population, you can use a simple mathematical concept called "proportions." Here's how you can explain it to a child:
To find the total population, we can set up a proportion using the information given to us. We know that 7/10 of the population is equal to 175,104,000 people. Let's call the total population "x."
Now, we can set up a proportion like this:
(7/10) / x = 175,104,000 / 1
To solve this proportion, we can use cross-multiplication. We multiply the values on the diagonals and set them equal to each other:
7 * 1 = 10 * 175,104,000
Now, let's solve for x by dividing both sides of the equation:
7 = 10 * 175,104,000 / x
Dividing both sides by 10:
7 / 10 = (10 * 175,104,000) / (10 * x)
Simplifying the equation:
7 / 10 = 175,104,000 / x
Now, we can cross-multiply again:
7 * x = 10 * 175,104,000
Now, divide both sides by 7 to isolate x:
x = (10 * 175,104,000) / 7
Using a calculator, we can evaluate the expression on the right side:
x = 2,501,485,714.29
So, the estimated total population in 1991 is approximately 2,501,485,714.
Remember, it's important to explain to the child that this number is an estimate based on the given information and the method used to calculate it.