CPM Homework Help : CC1MN Problem 9-34

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Home > CC1MN > Chapter 9 > Lesson 9.1.3 > Problem 9-34

9-34.

Compute each sum or difference.

Hint:

Before adding or subtracting, change one or both fractions so that they have the same denominator.

More Help:

Use a Giant One to convert to an equivalent fraction.

$\frac { 11 } { 12 } - \frac { 2 } { 3 }$
Step 1 (a):
Find the lowest common denominator.
$(3)(4)=12$
Step 2 (a):
Convert the fraction(s).
$\left ( \frac{2}{3} \right )\left ( \frac{4}{4} \right )=\frac{8}{12}$
Step 3 (a):
Find the sum or difference.
$\frac{11}{12}-\frac{8}{12}=\frac{3}{12}$
Step 4 (a):
Simplify, if necessary.
$\frac{3}{12}=\frac{1}{4}$

$\frac { 3 } { 8 } + \frac { 7 } { 12 }$
Answer (b):
$\frac{23}{24}$

$\frac { 9 } { 10 } + \frac { 5 } { 8 }$
Hint (c):
The lowest common denominator is $40$ .

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