Finding Percents of numbers Using the Is over Of technique in conjunction with drawing percent bars.
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Transcript of Finding Percents of numbers Using the Is over Of technique in conjunction with drawing percent bars.
Finding Percents of numbers
Using the Is over Of technique in conjunction with drawing
percent bars
What do you think is the answer??
• Find 25% of 20
• Let’s draw a picture.
x
100% 20
25%
Can you solve this as a proportion? • Find 25% of 20
• What would the proportion look like?
100%
x25%
20
10025
20x
X = 5
We can do this Mathematically by using a special
proportion...just find the following...The Percent – it is the easiest to find.
Just look for the % sign!
The “Of” number - it is always just behind the word of. It represents the total (or the whole.)
The “Is” number – This represents the part or the piece of the whole. (It may be near the word “is.”
Finding is, of or a Percent
Find the missing number by drawing a bar and using the proportion.
a) 15% of 900 is what?
100
%=
of
isUse the proportion…
15%
100% 900
?
10015
900x
x = 135
Finding is, of or a Percent
Find the missing number by drawing a bar and using
the proportion.
b) What % of 84 is 63?
100
%=
of
is
x%
100 84
63
100%
8463
X = 75%
Finding is, of or a Percent
c) 35% of what # is 7?
100
%=
of
is
Find the missing number by drawing a bar
and using the proportion.
35%
100 ?
710035
x7
X = 20