Question

What is \[10\% {\text{ }}of{\text{ }}39\]?

Answer 1

Hint: In mathematics, a percentage is a number or ratio that can be expressed as a fraction of 100. If we have to calculate percent of a number,  divide the number by whole and multiply by 100. Hence, the percentage means, a part per hundred. The word percent means per 100. It is represented by the symbol $\% $.
To find the number,we need to follow these steps.
> Visualize what a percentage represents. A percentage is an expression of part of the whole. $0\% $ represents nothing, and 100% represents the entire amount.
> Determine the value of the whole. In some cases, you will be given the value for part of the whole. Other times, you might get two parts that make up the whole.
> Find the value that you want to turn into a percentage.
Here, by simplification method we can solve the given sum

Complete step-by-step solution:
Here the given number is $39$.
We need to find $10\% $ of the given number.
Generally what we do is whatever the percentage is asked we need to take it in a fraction form .
That is \[10{\text{ }}\% \] can be written as $\dfrac{{10}}{{100}}$ .
In math, it denotes that we need to produce the number.
$\dfrac{10}{100}\text{of } 39 = \dfrac{10}{100}\times 39$
$ = \dfrac{1}{{10}} \times 39$ (as we cancel zero of units place both in numerator and denominator )
$ = 0.1 \times 39$ ( we convert the fraction 1/10 into decimal form)
$\;\;\;\;\;\; =3.9$
As we have one zero in the denominator, we get one decimal point that is $0.1$.
So \[10\% {\text{ }}of{\text{ }}39\] will be $3.9$

Note: In this answer you are observing that the answer is very much less that the question asked. It is because the percentage asked here is just $10\% $.
Putting points at the right decimal places is mandatory.
Cancelling both numerator and denominator in the same table is needed.
Additional information: we can do this in another way also
$\dfrac{10}{100}\text{of } 39 = \dfrac{10}{100}\times 39$ is asked
 \[ = \dfrac{{390}}{{100}}\] (by multiplying $39$ and $10$ we get $390$ )
 \[ = \dfrac{{39}}{{10}}\] (by cancelling zeros of units place )
$=3.9$ (by converting in to decimal notation )