Subtracting Fractions

 $\frac{1}{3}-\frac{1}{4}$  

•  $\frac{1}{2}$  

•  $\frac{1}{12}$  

•  $\frac{1}{6}$  

• None of the above

 $\frac{2}{3}-\frac{1}{2}$  

•  $\frac{7}{6}$  

•  $\frac{3}{5}$  

•  $\frac{1}{3}$  

•  $\frac{1}{6}$  

 $\frac{5}{6}-\frac{1}{4}$  

•  $\frac{7}{12}$  

•  $\frac{3}{24}$  

•  $\frac{3}{12}$  

•  $\frac{8}{24}$  

 $\frac{2}{3}-\frac{1}{7}$  

•  $\frac{11}{14}$  

•  $\frac{12}{21}$  

•  $\frac{8}{21}$  

•  $\frac{11}{21}$  

 $\frac{3}{4}-\frac{3}{8}$  

•  $\frac{6}{32}$  

•  $\frac{9}{24}$  

•  $\frac{12}{32}$  

•  $\frac{7}{24}$  

 $\frac{3}{4}-\frac{2}{7}$  

•  $\frac{13}{28}$  

•  $\frac{1}{3}$  

•  $\frac{10}{28}$  

•  $\frac{2}{3}$  

Mr. Penman had  $\frac{2}{3}$    liter of salt water. He used  $\frac{1}{5}$   of a liter for an experiment. How much salt water does Mr. Penman have left? 

•  $\frac{3}{8}$  L

•  $\frac{4}{15}$  L

•  $\frac{13}{15}$  L

•  $\frac{7}{15}$  L

Sandra says that  $\frac{4}{7}-\frac{1}{3}=\frac{3}{4}$ because all you have to do is subtract the numerators and subtract the denominators. Is she right?

• Yes. She subtracted correctly.

• No, because she didn't find the GCF to make like denominators.

• No, because she didn't subtract correctly.

 $1\ \frac{3}{8}\ -\frac{1}{2}$  

•  $\frac{5}{8}$  

•  $\frac{7}{8}$  

•  $\frac{9}{16}$  

•  $\frac{15}{8}$  

 $1\ \frac{2}{3}-\frac{3}{5}$ 

Answer with a mixed number. 

•  $1\ \frac{3}{15}$  

•  $1\ \frac{1}{15}$  

•  $\frac{16}{15}$  

•  $\frac{18}{15}$