What is 16/40 (A fraction) In lowest terms?

a. 2/5

b. 1/5

c. 1/4

d. 3/8

The answer is 2/5

16/40 8/20 4/10 2/5

In lowest terms, the answer would be a. 2/5 because what you do is divide the numerator and denominator by their greatest common factor. In this case, the greatest common factor of 16 and 40 is 8. Divide 16 and 40 by 8 and you will get the fraction 2/5. And since 2/5 cannot be simplified any longer, this lets you know that 16/40 in lowest terms is 2/5.