2. Our unit on Fractions, Decimals, and Percents is divided into
three sections. We have not yet completed the third section, but
we will soon. Our warm-up today will be two questions from
each of the three sections.
Do the warm-up questions as if you were taking the test. The
test on part I will be on Wednesday, January 27th. The
questions on the test will be similar to those today.
3. Section 1: Proportions/Ratios/Rates/Unit Rates
1. Express the following as a ratio in fractional form:
5 quarts to 2 gallons
2. The ratio of the length of a rectangle to its width is 5:2,
and the width is 24 inches. Find the length.
4. Section 2: Calculating & Converting Fractions/Decimals/Percents
1. What percent is represented by the fraction
𝟏𝟐
𝟏𝟎𝟎𝟎
?
A) 1.2% B) 120% C) 6% D) 60% E) .6%
2. After giving some seeds to a friend, Jill now has one-fifth of a
packet of seeds left over. She places the remaining seeds equally in
five flower pots. What fraction of the original seed packet does each
flower pot get?
What percent of the original
seed packet does each
flower pot get?
We know
𝟏
𝟓
, then what? 𝟏
𝟐𝟓
4%
5. Section 3: Finding Percent/Solving Percent Problems (so far)
1. If you are at school from 7:30 - 3:30, what percent of your
day is spent at school? (Round to nearest percent)
2. The winner of the grand prize in the raffle drawing
will get 15% of the prize now, which is $600. The rest of
the money is to be paid next month. How much is the
total grand prize?
6. Compliments:
Two numbers are compliments when their sum is equal
to 100%. In other words, the sum of the two parts equals
the whole. Every number has its own compliment.
Vocabulary:
The compliment of 55% is what?
How to Use Compliments:
1. A $50 pair of shoes is on
sale for 20% off. How much
will you pay for the shoes?
$45.00
Solve in one step:
7.
8. When you need to find the percent of a set
quantity (not changing), then you can use the
percent proportion to solve.
Example: Dwight missed 9 out of 12 free throws,
what percent did he make?
X = 3
100 12
However, when you want to find the percent of something
that has changed (price, population, quantity), you then use
the percent of change formula….
9. A percent change is an increase or decrease given as a
percent of the original amount.
All percent changes are written as positive numbers.
A percent decrease describes an amount that has been
reduced.
A percent increase describes an amount that has grown
Percent Change :
10. Percent Change :
1. Find the % change: From $3.00 to $5.00
3. In 2010, a can of Coke cost $.50. The 2014 price is $.85.
What is the percent increase for the cost of a Coke?
2. Find the % change: From $5.00 to $3.00
Last question, and very do-able using mental math only: In
2005, the enrollment at MHS was ≈ 1100 students. Today it is
≈ 1600. What is the percent change in enrollment.
