Date post: | 21-Jan-2016 |
Category: |
Documents |
Upload: | matilda-hunter |
View: | 227 times |
Download: | 0 times |
Main Idea
NGSSS
Key Concept:Percents and Decimals
Example 1:Percents as Decimals
Example 2:Percents as Decimals
Example 3: Decimals as Percents
Example 4: Decimals as Percents
Example 5: Fractions as Percents
Example 6: Fractions as Percents
Example 7: Compare Rational Numbers
Example 8: Order Rational Numbers
Five-Minute Check
• Compare and order rational numbers.
MA.8.A.6.4 Perform operations on real numbers (including integer exponents, radicals, percents, scientific notation, absolute value, rational numbers, and irrational numbers) using multi-step and real world problems.
Percents as Decimals
Write 52% as a decimal.
52% = 52%Divide by 100.
= 0.52Remove the percent symbol.
Answer: 0.52
Write 245% as a decimal.
Percents as Decimals
245% = 245%Divide by 100.
= 2.45Remove the percent symbol.
Answer: 2.45
Decimals as Percents
Write 0.3 as a percent.
0.3= 0.30Multiply by 100.
= 30% Add the percent symbol.
Answer: 30%
Write 2.71 as a percent.
Decimals as Percents
2.71= 2.71Multiply by 100.
= 271% Add the percent symbol.
Answer: 271%
Fractions as Percents
Method 1 Use a proportion.
Write as a percent.
First write as a decimal. Then write as a percent.
Method 2 Write as a decimal.
Fractions as Percents
Answer: So, or 75%.
0.75
= 75%
Fractions as Percents
Write as a percent.
– 640
– 3640
Answer: So, .
0.166_
– 364
0.166 …
Compare Rational Numbers
Answer: Marysville
POLITICS In Sun City, 0.45 of the voters are Democrats. In Marysville, 48% of the voters are Democrats. In which town is there a greater portion of Democrats?
Since 0.45 = 45% and 45% < 48%, Marysville has a greater portion of Democrats.
A. There were more hound dogs than sporting dogs.
B. There were more herding dogs than hound dogs.
C. There were more sporting dogs than hound dogs.
D. There were the same number of sporting dogs and hound dogs.
DOGS In a dog show, of the dogs were
hounds, 17% were sporting dogs, and 13 out of
125 were herding dogs. Which is a true
statement?
Order Rational Numbers
From least to greatest, the percents are 7%, 70%, 76%, and 77%.
Answer: So, from least to greatest, the numbers
are
and 0.77.
Order 0.77, from least to greatest.