Adding and Subtracting Mixed Numbers with Common Denominators

When adding or subtracting rational numbers, what must you have?

• Common Numerator

• Quick Answering Skills

• Common Numbers

• Common Denominators

When adding or subtracting RATIONAL NUMBERS with LIKE DENOMINATOR denominator you should

• multiply the denominators

• add or subtract the numerators

• keep the denominator

• simplify if need

Find Lowest Common Denominator & solve
1   3/7      +       7   5/11 =

• 8   68/77

• 8   68/107

• 8   10/77

• 8    8/18

Find Lowest Common Denominator & solve
4    1/2    +   14    6/12 =

• 18   7/14

• 18   12/12

• 18   24/24

• 18

• 1    5/12
• 3     11/24
• 3    11/12
• 3    1/2

Solve

• 11 3/4

• 11 3/8

• 11

• 3/4

1 11/12 + 2 5/12

• 4 1/3

• 3 4/12

• 4 16/12

What is the sum?

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• 
• 
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Find Lowest Common Denominator & solve
1    1/3   +    4    1/4 =

• 5    7/12

• 5    2/24

• 5    2/12

• 5    7/24