Fractions, Decimals, Percents Page 3
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1
2
3factors – numbers that are multiplied – alternately – numbers that
Multiples – “counting by” numbers – numbers gotten by
divide another number evenly
multiplying one number by other numbers
Example: 2 – 2, 4, 6, 8, 10, 12, …
Example: 60: 1, 2 , 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
GCF
LCM
find all factors of both numbers
List the multiples of the numbers until you get a match.
then select the ones that are common to both, and
then choose the greatest (biggest).
Example: Find the least common multiple for 6 and
8
Example: What are the common factors of 15 and 30?
Multiples of 4 are: 4, 8, 12, 16, 20, 24, 28, 32, 36, ...
The factors of 15 are 1, 3, 5, and 15
Multiples of 6 are: 6, 12, 18, 24, 30, 36, ...
The factors of 30 are 1, 2, 3, 5, 6, 10, 15 and 30
15 is the GCF.
probability – the chance that something is going to happen
mean – (average) the sum of the data divided by how many
pieces of data there are
median – the middle number when a set of numbers are
Probability =
arranged in order – if there are two middle numbers, add them
# of ways that an event can occur
# of possible outcomes
together and divide by 2
mode – the number(s) that appears most in a set of data
What is the probability of choosing a vowel from the
alphabet? 5 vowels out of 26 letters – probability 5/26
prime number – a number with exactly 2 factors – one and itself
Proportions – one way to solve is to cross-multiply and divide
composite number – numbers with 3 or more factors
** 0 and 1 are neither prime nor composite
(2)(6) ÷ 3 = 4
A ratio is a comparison of two numbers or measurements. The
Prime Factorization – use factor trees
numbers or measurements being compared are called the
terms of the ratio.
A rate is a special ratio in which the two terms are in different
units. When rates are expressed as a quantity of 1, such as 2
feet per second or 5 miles per hour, they are called unit rates.
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