Question

Choose the fraction that has not been reduced to simplest form.

Answer 1

The answer would be (C).

To be fully simplified, the numerator and denominator must have a GCF of 1.

Answer (C) says 3/57. However, using the divisibility rule of 3 (add the digits together, and if the sum is a multiple of 3, then the number is as well), we see that 57 is divisible by 3, meaning this fraction is not simplified. The simplified version would be 1/19.

Answer 2

When a fraction is in reduced form, one of the numbers will be a multiple of the other.

In $\frac{11}{17}$ one of the numbers is NOT a multiple of the other.

In $\frac{5}{16}$ one of the numbers is NOT a multiple of the other.

In $\frac{3}{57}$ one of the numbers IS a multiple of the other.

$\frac{3 \div 3}{57 \div 3} = \frac{1}{19}$

In $\frac{21}{34}$ one of the numbers is NOT a multiple of the other.

Your answer is C