Making Sense of Percents
Published on Nov 19, 2015
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PRESENTATION OUTLINE
COMMON CORE
GRADE 6 MATHEMATICS
FEAR! ANXIETY!
These are common reactions to having to think about mathematics.
How do you feel when you hear the word MATH?
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RELAX,LET'S DO
SOME MENTAL MATH!
RELAX!
We're going to work through this together.
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NO PENCILS!
LET'S USE OUR HEADS.
Maybe this is one of those times when a pencil can slow you down.
Let's think about this.
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THE PROBLEM:
FIND 65% OF 80.
We are being asked to find 65% of 80.
The fortune cookie tells us that you are a deep thinker with a knack for problem solving.
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100% MEANS
THE WHOLE THING
100% means the entire quantity.
100% of 10 is 10.
100% of 1 is 1.
100% of 1/2 is 1/2.
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50% MEANS
HALF
50% means half of the whole? It could be a half-moon, or half of a pizza.
50% of 10 is 5.
50% of 1 is 1/2.
50% of 1/2 is 1/4.
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10% MEANS
A TENTH, DIVIDE BY 10
10% means a tenth of the whole.
A tenth of one dollar is a dime.
10% of 10 is 1.
10% of 1 is 0.1.
10% of 1/2 is 1/20 or 0.05.
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5% MEANS
5 OUT OF EVERY 100; OR HALF OF 10%.
5% is half of 10%. 5% of a dollar is a nickel.
5% of 100 is 5.
5% of 10 is 0.5.
5% of 1 is 0.05.
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CHUNK THE WHOLE!
50% + 10% + 5% = 65%
We'll break this down and deal with smaller and friendlier pieces called chunks.
We'll think about 50% of 80, 10% of 80, and 5% of 80.
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DO YOU KNOW
THE ANSWER?
If you can add these numbers correctly, you have the answer.
Add: 40 + 8 + 4
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