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!