CPM Homework Help : CC2 Problem 8-9

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8-9.

Simplify each expression.

$-\frac{4}{5}+\frac{7}{12}$
Hint (a):
Find a common denominator and simplify.
More Help (a):
$\left(-\frac{4}{5}\right)\left(\frac{12}{12}\right)+\left(\frac{7}{12}\right)\left(\frac{5}{5}\right)$
Answer (a):
$-\frac{13}{60}$

$\frac{5}{9}+\left(-\frac{1}{4}\right)$
Hint (b):
Remember that adding a negative number is essentially subtraction.
Answer (b):
$\frac{11}{36}$

$-\frac{3}{7}\cdot\frac{11}{12}$
Hint (c):
Multiply the numerators together and the denominators together.

$-1\frac{2}{3}\cdot\frac{4}{5}$
Hint (d):
Turning the first fraction into a fraction greater than one may prove to be more helpful.

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