pie chartspie charts for erin. part 1: pie charts with fractions
Post on 02-Jan-2016
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To understand a pie chart, you need to find out 2 pieces of information:
1) what is the total number?E.g. 40 children in total
2) what are the fractions? E.g. ¼ of each
There are 40 children in the class.
Black hairBrown hairBlond hairRed hair
1/4
How many children in total?
Black hairBrown hairBlond hairRed hair
1/4
How many have black hair?
There are 40 children in the class.
Black hairBrown hairBlond hairRed hair
1/4
What is ¼ of 40?
Children with black hair are¼ of the total (40)
There are 40 children in the class.
Black hairBrown hairBlond hairRed hair
1/4
10 children with black hair
There are 40 children in the class.
Treat PERCENTAGES the same way as fractions:
To understand a pie chart, you need to find out 2 pieces of information:
1) what is the total number?E.g. 40 children in total
2) what are the fractions? You need to convert the percentages to fractions!
The fraction will be /100.
There are 40 children in the class.
Black hairBrown hairBlond hairRed hair
25%
How many children in total?
Black hairBrown hairBlond hairRed hair
25%
How many have black hair?
There are 40 children in the class.
Black hairBrown hairBlond hairRed hair
25%
What is the fraction?
Children with black hair are25% of the total (40)
There are 40 children in the class.
25% = 1/4
Black hairBrown hairBlond hairRed hair
25%
¼ of 40 = ?
Children with black hair are25% of the total (40)
There are 40 children in the class.
Black hairBrown hairBlond hairRed hair
1/4
10 children with black hair
There are 40 children in the class.
Treat PERCENTAGES the same way as fractions:
To understand a pie chart, you need to find out 2 pieces of information:
1) what is the total number?E.g. 40 children in total
2) what are the fractions? You need to convert the degrees to fractions!
The fraction will be /360.
As always, to understand such a pie chart, you need to find out 2 pieces of information:
1) what is the total number?E.g. 40 children in total
2) what are the fractions create an equivalent fraction!! E.g. 90° = 90/360 = 1/4
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