If you have to change the fractions to decimals first, you simply have to write all the divisions in a calculator:
[tex]\dfrac{1}{5}=0.2[/tex]
[tex]\dfrac{5}{25}=0.2[/tex]
[tex]\dfrac{20}{100}=0.2[/tex]
[tex]\dfrac{5}{20}=0.25[/tex]
[tex]\dfrac{2}{10}=0.2[/tex]
So, as you can see, the only different value is 5/20
3. 5/20 is the answer.
You don't even need to convert the fractions into decimals.
Understand that 1/5 can be multiplied by 5 to get 5/25 by multiplying both numerator and denominator. Same goes with all the others except 5/20. You would need to multiply 1 (numerator) by 5 and 5 (denominator) by 4 which is different numbers so it is isn't the same.
