How do you convert $\dfrac{7}{{10}}$ to a percent?

Hint: It is always better to look at the denominator first when we need to convert a fraction into decimal. If a denominator only has $2$ and $5$ as prime factors, one way of writing a fraction as a decimal is to change the fraction so the denominator is a power of $10$ . In case it has a prime factor other than $2$ and $5$ , conversion to decimal could be longer and will result in an infinite loop with repeating decimals.
However, $10$ divides or multiplies into any power of $10$ so the denominator is a power of $10$ so this is an easy question.

Complete step-by-step answer:
According to the given information, we need to turn $\dfrac{7}{{10}}$ to a percent.
One possible way to rewrite $\dfrac{7}{{10}}$ is $7$÷10
On multiplied by 100, we get
$\dfrac{7}{{10}} \times 100 = 70\% $
Therefore,
$\dfrac{7}{{10}}$ can be written as $70\% $ percent.

Note: In this type of question you must look at the denominator. And denominators divide or multiply into power of $10$ then it is easy to solve that question. You can convert all fractions to decimals. The decimal forms of rational numbers either end or repeat a pattern. Mathematically, to convert a fraction to a decimal number means to perform the mathematical division of the numerator by the denominator.