Question

Show that each number is a rational number by writing it as a ratio of integers

Answer 1

When you have a non-periodic decimal number, you can write it as a fraction. The numerator is the whole number, without the decimal separator. The denominator is a power of 10, 10^k, where k is the number of decimal digits.

So, you have

$0.7 = \dfrac{7}{10}$

Since you only have one decimal digit.

-6 is an integer, and any integer can be written as a fraction with denominator 1:

$-6=\dfrac{-6}{1}$

The percentage symbol simply means "divided by 100":

$15\%= \dfrac{15}{100}$

-4/11 is already a fraction between integers, so it's already in the requested form.

-4.3 work like 0.7:

$-4.3 = \dfrac{-43}{10}$