S
How do we divide fractions?
KCF
Keep, Change, Flip
1.What are decimals?
2. Write these decimals as fractions:
0.3 0.82 0.07 0.391
1. A decimal is a shortcut to write a fraction over 10, 100, 1000.
3/10 82/100 7/100 391/1000
1.How do we convert a mixed number into an improper fraction?
2. How do we change an improper fraction into a mixed number?
1. Cartwheel Method (Teacher Demo)
2. Divide the numerator by the denominator. Write the remainder as a fraction.
1) How do you simplify fractions?
2) How can we simplify 6/15?
1) Divide the numerator (top) and the denominator (bottom) by the same number.
2) 2/5
What is the definition of percent?
How do you write 34% as a fraction?
A percent is a fraction out of 100
34/100
How would you find the percent of a number?
Example: Find 20% of $80.
Change the percent into a decimal and multiply it by the number.
Example: .20 x 80 = 16
1. How can you find the diameter when given the radius?
2. How can you find the radius when given the diameter?
2. Diameter / 2 = Radius
1. How do you calculate the Mean/Average?
2. How do you calculate the Median?
To calculate Mean/Average:
Add, Count, Divide
To calculate Median:
Put the number in order for least to greatest!
Choose the number in the middle
* If there is a tie between two numbers in the middle, add them and divide by 2. *
Following the rules of multiplying and dividing with negatives, are thee answers positive or negative?
-1/2 x 3/4 =
-A x -B =
4.8 / -1.2 =
323 / 2 =
Negative
Positive
Negative
Positive
1. What is an angle?
2. How are angles measured?
The space between two lines
0-360 degrees
Before solving how would you simplify these problems?
1) 5 + - 3
2) -7 - - 2
1) 5 - 3
2) -7 + 2
What are two ways you can write your answer with pi?
Use the symbol or the number 3.14.
How can you simplify an expression like this one:
4x + 3 + 2x + 5
6x + 8
Name and describe or sketch the two most famous angles.
Straight angle is 180 degrees.
1. What is probability?
2. How do you find probability?
1. The chance of something happening
2. Desired outcome/Total outcome
What is a measure of center? Give 2 examples.
What is a measure of variability? Give 2 examples.
Measures of center represent a typical value of the data set.
Examples: Mean, Median, Mode
Measures of variability (spread) represent how far apart data is.
Examples: Range, MAD, IQR (interquartile range)
1.What is the difference between a population and a sample?
2.Why take a sample instead of surveying the whole population?
1. Population - the whole group you are studying
Sample - the small of the population you survey
2. Samples are more efficient (faster and easier)
What makes a sample representative and not biased?
Representative samples:
1. Sample is FROM the population
2. Sample is as BIG as possible
3. Sample is RANDOM
Biased samples are not fair or favor one group.
How do you find the surface area of a 3D shape?
List all of the faces
Find the area of each face
Add all the areas
How do you read each of these symbols
1) <
2) >
3) ≤
4) ≥
1) Less than
2) Greater than
3) Less than or equal to
4) Greater than or equal to