Question

There are 1,500 students in a school. 65% are girls. How many girls are there in the school?

Answer 1

The answer is:  " 975 girls " .
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Explanation:
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What is 65% of 1500?
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  65/100 * 1500/1 = ?  ;

The two "zeros" in "100" cancel out;  
and the two "zeros" in "1500" cancel out;
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    And we are left with:
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    65/1  * 15/1 = 65 * 15 = 975 girls.
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OTHER METHOD:
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   65% of 1500 = 65/100 * 1500 = 0.65 * 1500 = 975 girls.
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OTHER Method:
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  65% of 1500 = 65/100 * 1500 ;

Note:  65/100 = (65÷5) / (100÷5) = 13/20;

13/20 * 1500 = 13/20 * 1500/1 = ? ;

 The "zero" in "20" cancels out; and the last zero in "1500" cancels out;

and we have:  13/2 * 150/1 ;  

The "2" cancels to a "1" ; and the "150" cancels to a "75"; 

and we have:  13/1 * 75/1 = 13 * 75 = 975 .
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Answer 2

1500 x 0.65= Number of girls
=975