Question

Sam had 4/5 yards of yarn. He used 3/8 of the yarn. How many yards of yarn did he use?

Answer 1

we know that

1) Sam had $\frac{4}{5}$ yards of yarn

2) Sam used $\frac{3}{8}$ of the yarn

so

To calculate how many yards of yarn he used

Multiply $\frac{4}{5}$ by $\frac{3}{8}$

$\frac{4}{5} *\frac{3}{8} =\frac{12}{40} \ yards$

Simplify

Divide by $4$ both numerator and denominator

$\frac{12}{40}=\frac{(12/4)}{(40/4)}=\frac{3}{10}\ yards$

therefore

the answer is the option C

$\frac{3}{10}\ yards$

Answer 2

c)3/10 is the correct answer.

3/8*4/5=12/40

12/40=3/10 or 0.3