91Ó°ÊÓ

Multiply. $$ \frac{3}{7} \cdot 21 n $$

Multiply. $$ \frac{5}{6} \cdot 30 m $$

Divide. $$ \frac{3}{4} \div \frac{2}{3} $$

Divide. $$ -\frac{5}{6} \div\left(-\frac{5}{6}\right) $$

Simplify. $$ \frac{-\frac{9}{16}}{\frac{33}{40}} $$

A recipe for chocolate chip cookies calls for \(\frac{3}{4}\) cup brown sugar. Imelda wants to double the recipe. (a) How much brown sugar will Imelda need? Show your calculation. (b) Measuring cups usually come in sets of \(\frac{1}{4}, \frac{1}{3}, \frac{1}{2},\) and 1 cup. Draw a diagram to show two different ways that Imelda could measure the brown sugar needed to double the cookie recipe.

Nina is making 4 pans of fudge to serve after a music recital. For each pan, she needs \(\frac{2}{3}\) cup of condensed milk. (a) How much condensed milk will Nina need? Show your calculation. (b) Measuring cups usually come in sets of \(\frac{1}{4}, \frac{1}{3}, \frac{1}{2},\) and 1 cup. Draw a diagram to show two different ways that Nina could measure the condensed milk needed for 4 pans of fudge.

Explain how you find the reciprocal of a negative number.

Add or subtract. $$ \frac{5}{6}-\frac{3}{4} $$

Simplify. $$ \frac{2}{\frac{1}{3}+\frac{1}{5}} $$