CPM Homework Help : INT1 Problem A-54

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A-54.

Simplify each expression.

$-\frac{2}{3}+\frac{4}{5}$
Step 1(a):
Multiply by fractions equal to one to make the denominators the same.
$-\frac{2}{3}\cdot\frac{5}{5}+\frac{4}{5}\cdot\frac{3}{3}=-\frac{10}{15}+\frac{12}{15}$
Answer (a):
$\frac{2}{15}$

$2−\frac{3}{8}$
Hint (b):
Change $2$ into a fraction greater than one.

$-\frac{3}{5}·10$
Hint (c):
Simplify before multiplying.

$\frac { 2 } { 3 }÷ −2$
Hint (d):
Multiply by the reciprocal.
Answer (d):
$-\frac{1}{3}$

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