Percent Intro… A11 Demonstrate Number Sense for Percent.
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Transcript of Percent Intro… A11 Demonstrate Number Sense for Percent.
Percent Intro…
A11 Demonstrate Number Sense for Percent
What does Percent mean?
Percent means “out of 100”So if we know a fraction, or a decimal, we can
easily write the percent…
53
10060
53
60%
X 20
X 20
What is the percent of the shaded region?
107
10070
107
70%
X 10
X 10
What is the percent of the shaded region?
2014
10070
2014
70%
X 5
X 5
Try These!
Find the percent for each shape
given on your worksheet…
You have 5 minutes!
%5010050
42
%2510025
41
50% 25% 37.5%
%5.37100
5.371000375
83
What percent is shaded?
%5010050
42
%3.333.062
%6.666.032
50% %3.33 %6.66
What percent is shaded?
%7543
86
%40or 10040
52
75% %40 %100
Estimating Percents
When the individual sections are not marked,
we can estimate the fraction and the percent
Estimate the percent of the shaded region
41
%2510025
41
Estimate the percent of the shaded region
104
%4010040
104
It is less than 50% but more than 25%.
Looks like more than one third…
I could draw lines in to get a fraction…
Estimate the percent of the shaded region
85
%5.62100
5.6285
It is more than 50% but less than 75%.
Looks like a little more than one third is not shaded… so about 66% shaded?
I could draw lines in to get a fraction…
Try These!
Time to practice!
Complete the worksheet titled,
“Introducing Percent”
Introducing Percent Worksheet
63% 42% 18%
45% 82% 35%
Introducing Percent Worksheet
25% 50%
60% 50% 25% 75%
20% 33%
Introducing Percent Worksheet
Introducing Percent Worksheet
Introducing Percent Worksheet
10% 20% 70% 75% 90%
66%33%
Introducing Percent Worksheet
50%25% 75%10%
20% 60% 80% 90%
Try These!
More practice!
Try this worksheet…
Finish for homework!
Try These!
Try These!
Try These!
Try These!
41
21
0.25 25%
0.5 50%
Try These!
53
107
43
0.6 60%
0.75 75%
0.7 70%
Finding Mistakes
Now that we can determine or estimate
the percent or from a picture,
We can find mistakes when pictures are labelled incorrectly…
What’s wrong with this picture?
One whole is the same as 100%
55%
35%20%
All sectors should have a sum of 100%...
55% + 35% + 20% ≠ 100
What’s wrong with this picture?
How would you label these pieces correctly?
What’s wrong with these pictures?
Do all sectors total 100%
Try These!
Time to practice!
Turn to Check Your Understanding
Starting on Page 115
Do #’s 1, 2, 4, 5, 7, and 8
Check Your Understanding #1
50% 75% 10% 100%
Check Your Understanding #1
Check Your Understanding #1
40% 64%
Check Your Understanding
Check Your Understanding
a) Reverse labels
b) 20% pieces should be the same size!
c) 55% looks like 50%25% and 30% look equaladd up to a total of 110%!
d) Total should be 100%(looks like degrees!)
Quiz Time!