Answer:
Both are correct.
A) A decimal fraction
B) A common fraction
Step-by-step explanation:
1 step. Write down 0.4 divided by 1:
[tex]\dfrac{0.4}{1}.[/tex]
2 step. Multiply both top and bottom by 10 (because there are 1 digit after the decimal point):
[tex]\dfrac{0.4}{1}=\dfrac{0.4\cdot 10}{1\cdot 10}=\dfrac{4}{10}.[/tex]
This fraction is called a decimal fraction.
3 step. Simplify the decimal fraction:
[tex]\dfrac{4}{10}=\dfrac{2\cdot 2}{2\cdot 5}=\dfrac{2}{5}.[/tex]
This fraction is called a common fraction.
