Fractions
The top number of a fraction.
Numerator
12.34567
The number in the ten-thousandths place.
6
When the second event is NOT affected by the first...
Independent
1/2 as a percent
50%
The arithmetic operation represented by a fraction.
Division
What is an irrational number?
A decimal which doesn't repeat or terminate
A bag of balloons consists of 47 white balloons, 5 yellow balloons, and 10 black balloons. What is the approximate likelihood that a balloon chosen randomly from the bag will be black?
16%
First, calculate the total number of balloons in the bag: 47+5+10=62.
10 of these are black, so divide 10 by 62. Then multiply by 100 to express the probability as a percentage: 10/62 = 0.16
0.16 x 100 = 16%
0. 234 written as a percent
23.4%
A fraction in which the top number is larger than your bottom.
Improper
The range of whole numbers in scientific notation (The digit to the left of the decimal point).
1 through 9
Probability of flipping a coin and landing on tails 3 times in a row.
1/8
When you left your tiny hometown for college, the population was 840. You recently heard the population has grown by 5%. What is the present population?
The population is now 882.
The increase is 5% of the original: (0.05)(840)=42
The new population is the old population plus the increase: 840 + 42 = 882
What the top and bottom numbers must have in "common" to reduce
A common factor
Written as a decimal...
2.3 x 10 -5
0.000023
What does the exclamation point mean?
4!
Factorial...multiply all counting numbers from 4 to 1
An item originally priced at $55 is marked 25% off. What is the sale price?
The sale price is $41.25
First, the markdown is 25% of the original price:
x=(0.25)(55) = 13.75
Subtract this markdown from the original price:
55 - 13.75 = 41.25