Circle the fraction in the set with the least value 4/3 5/5 4/4 1/2 1/1

When looking at fractions if the top number ( numerator) is larger then the bottom number ( denominator) the value of the fraction is greater than 1

if both the top and bottom numbers are the same, the fraction equals 1

if the top number is smaller than the bottom number then the fraction is less than 1
 so with the fractions you have:

4/3 ( 4 is larger than 3 so this is greater than 1)
5/5 ( 5 = 5, so this = 1 )
4/4 ( 4=4, so this = 1)
1/2 ( 1 is smaller than 2 so this is less than 1)
1/1 ( 1 =1 so this = 1)

since 1/2 is less than 1, this is the fraction with the least value