Fractions with the Denominator or Numerator

When Adding UNLIKE denominators fractions:

To find the numerator, you need to

• The denominator remain the same

• Cross multiply the denominators and add the results

• Multiply denominator

• Add numerators

When Adding LIKE denominators fractions:

To find the numerator, you need to

• The numerator remain the same

• Cross multiply the numerators

• Multiply numerators

• Add Numerators

Add

Solve and simplify to lowest terms.

• a

• b

• c

• d

When the denominators are not the same, I must find a...

• common numerator

• common denominator

• equivalent fraction

• mixed number

When adding or subtracting fractions, I NEVER add or subtract the...

• numerators

• denominators

• mixed numbers

• equivalent fractions

What must you do first in order to add or subtract fractions with unlike denominators?

• add the numerators

• add the denominators

• find a common denominator

• find a common numerator

Solve.

• 5/8

• 23/40

• 21/40

• 1/2

Solve.

• 1 5/8

• 1/8

• 1/4

• 1 1/4