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dmitriy555 [2]
3 years ago
11

How do I find 45% of 320 by multiplying?

Mathematics
2 answers:
Juliette [100K]3 years ago
7 0
1. We assume, that the number 320 is 100% - because it's the output value of the task. 
<span>2. We assume, that x is the value we are looking for. </span>
<span>3. If 320 is 100%, so we can write it down as 320=100%. </span>
<span>4. We know, that x is 45% of the output value, so we can write it down as x=45%. </span>
5. Now we have two simple equations:
1) 320=100%
2) x=45%
where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:
320/x=100%/45%
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for what is 45% of 320

320/x=100/45
<span>(320/x)*x=(100/45)*x       - </span>we multiply both sides of the equation by x
<span>320=2.22222222222*x       - </span>we divide both sides of the equation by (2.22222222222) to get x
<span>320/2.22222222222=x </span>
<span>144=x </span>
x=144

<span>now we have: </span>
<span>45% of 320=144</span>
statuscvo [17]3 years ago
4 0
Well the percent sign, %, literally means out of 100. So, you are multiplying like this:
.45 • 320
=
144
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