# How to Add and Subtract Fractions - PowerPoint PPT Presentation

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## How to Add and Subtract Fractions

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### How to Add and Subtract Fractions With Pizza! By Frank Wang Pizza You all love pizza, don t you? With pizza, you can learn a new math skill! – PowerPoint PPT presentation

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Title: How to Add and Subtract Fractions

1
How to Add and Subtract Fractions With Pizza!
• By Frank Wang

2
Pizza
• You all love pizza, dont you? With pizza, you
can learn a new math skill! FRACTONS!

3
Do this
• What is 1/3 plus ½? Lets try it with pizza.

1/3
1/2
5/6
4
Walkthrough
• Lets go through that with the actual numbers now
that you understand what to do with pizza. First,
make the denominators the same. The only way to
add and subtract fractions is to have the same
denominator for both fractions.

1/3 2/6 (1x22, 3x26)
½3/6 (1x33, 2x36)
5
Walkthrough 2
• Then, add the NUMERATORS and NOT the
DENOMINATORS. This is because the denominators
are how many pieces the whole is split into, and
you arent splitting it up more.

2/6 3/6 5/6
6
Subtracting Fractions
• Its the same with subtraction with fractions.
Make the fractions have the same denominator and
then subtract the numerators and keep the
denominator.

½ - 1/3 ?
½ 3/6, 1/32/6
3-21, so the answer is 1/6
7
Review
• Do you understand now? Good. Try this question.
• 3/5 1/2

8
Answer
• If you got 1/10, great job! If you got something
different, here is how I got that.
• 3/5 6/10 ½ 5/10
• (3x26,5x210) (1x55, 2x510)
• 6-51, so the answer is 1/10

9
Thank You for Participating!
• EVERYTHING BY FRANK (except the methods)
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