Percents/Fractions/Decimals
What are two other ways to write 2/8?
.25 or 25% (or 25/100)
Which decimal number will be a percent greater than 100? How do you know?
a.) 3.15
b.) .315
c.) .0315
a), because 3.15 as a percent will be 315%, and as a fraction it would be 315/100.
In other words, 3.15 is greater than 1.00 or one whole.
Estimate 47% of 198.
~50% x 200
.5 x 200
= 100
What is the percent equation? What does each variable stand for?
p * w = x
percent (decimal form) * whole = part
What is the area of a triangle with a height of 15 ft and a base of 4 ft?
a = (b x h) / 2
a = (4 x 15) / 2
a = 60 / 2
a = 30 ft2
What's greater, 2/5 or 35%?
2/5 = .4 or .40
35% = .35
So 2/5 > 35%.
What is .75% as a fraction?
.75% = .75/100 = 75/10000
or 3/4% = 3/400
Estimate 42% of 42.
42% of 42
~2/5 * 40 = 16
Find 36% of 36.
p * w = x
36% * 36 = x
.36 * 36 = 12.96
There are 5 people who share a birthday with Sr. Bissan at this school. Name 3 of them. :)
- Shahad
- her twin brother, Saif
- Sr. Maymouna
- Sr. Nastasja
- Idris (5C kid)
What are the equivalent percents to the following?
a.) 1/2
b.) 2/3
c.) 3/4
a.) 1/2 = 50%
b.) 2/3 = 66% or 66.6% (or even 67%)
c.) 3/4 = 75%
How do I go from a decimal percent to just a decimal?
ex. How do I change .5% to a decimal?
Move the decimal LEFT twice. (think D <-- P, backwards alphabetical order.)
.5% = .005
53% of 78 students are likely going to attend summer school. About how many students will go to summer school?
53% of 78
~50% of 80
.5 * 80 = about 40 students
A pair of sneakers costs $120. They are on sale for $30 off. What is the percent of the discount?
p * 120 = 30
(divide using inverse operations)
p = 30/120 or .25
p = 25%
What is the mean of the following list of numbers?
10, 14, 11, 18, 15, 14, 2
10 + 14 + 11+ 18 + 15 + 14 + 2 = 84
7 items in the list
mean = 84/7 = 12
Sr. Bissan kept track of the weather for April and May, The sun was shining on 4 out of every 5 days. What percent of the days was the sun NOT shining?
4/5 = 80% of the days the sun WAS shining
meaning 1/5 or 20% of the days the sun was NOT shining
What is the difference between 1/5 and 1/5%?
1/5 = .2 = 20% or 20/100
1/5% = .002 = .2% = .2/100 = 2/1000 = 1/500
Ms. Maddi and Ms. Bartz got 200 lollipops for the fun fair. They sold 55% of the magnets. Ms. Maddi said they sold about 100 lollipops. Ms. Bartz said they sold about 120 lollipops. Could both be correct? Explain.
Yes!
If they rounded 55% down and estimated 50% of 200, they would have sold about 100.
However, if they rounded 55% up, and estimated 60% of 200, they would have sold about 120.
The new iphone 15 costs 1500. Apple is having a sale for 25% off of the original price.
a.) What is the price of the discount?
b.) What is the final price?
p * w = x
.25 * 1500 = x
x = 375 (discount)
1500 - 375 = $1125 (final price)
Simplify.
- 4x2 + 3x - 7x2 + x - 3y + y
LIKE TERMS & INTEGER RULES !!
(- 4x2 - 7x2) and (+ 3x + x) and (- 3y + y)
= - 11x2 + 4x - 2y
Line segment AB is 8 ft. If this line segment represents 25% of the whole line, what is the length of the whole line (aka 100%)?
8 ft is 25%
? ft is 100%
Use equivalent ratios and find that 25 x 4 = 100, so 8 x 4 = 32.
or do a ratio table and multiply 100 to 8 and then divide by 25, so 800/5 = 32.
Change 3/4% to a fraction and decimal.
Decimal = .75% = .0075
My uncle bought tickets to Palestine. The total was $1498. He got them on sale for 9% off. Approximately what was his new total?
9% * 1498
.10 * 1500 = 150
1500 - 150 = $1350
Sr. Bissan bought a pack of Smarties. The total cost of the Smarties were $5.00. However, there was a TAX of 5% of her total. What was the EXTRA amount she had to pay? What was her final price?
.05 * 5 = x (tax)
x = .25
original price plus part (tax)
5 + .25 = $5.25
Solve for the variable f.
20(f-5) = 50
f = 7.5
;)