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# Fraction Review - PowerPoint PPT Presentation

Fraction Review. OPERATIONS WITH FRACTIONS. We NEED to find a common denominator when we ADD or SUBTRACT fractions. We do NOT NEED to find a common denominator when we MULTIPLY or DIVIDE fractions. Adding Fractions. Find a common denominator

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Presentation Transcript

We NEED to find a common denominator when we ADD or SUBTRACT fractions

We do NOT NEED to find a common denominator when we MULTIPLY or DIVIDE fractions

Find a common denominator

Change one or both fractions so the denominator is the same and ADD the numerators together (remember, if you multiply the denominator by a number to change it, you MUST multiply the numerator by the same number).

½ + ⅓ =

Subtracting Fractions

To subtract fractions:

1. find common denominator.

2. Subtract the numerators

3. Reduce/change to a mixed number.

¾ − ⅛ =

To multiply fractions:

1. multiply numerators straight across.

2. Multiply denominators straight across

3. Reduce/change to a mixed number.

⅚ × ⅕ =

Dividing Fractions

To divide fractions:

1.Keep the first fraction the same.

2.Change ÷ into ×

3.Flip the second fraction.

⅜ ÷ ⅘ =

Improper fractions are fractions that have a greater numerator than denominator. To simplify improper fractions, find out how many times the denominator will fit in the numerator. This becomes your whole number...

IN other words, divide the numerator by the denominator. The result should be a whole number. If there is a remainder, that becomes the new numerator with the original denominator on the bottom.

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