FactorsMultiples

1
Prime Numbers Composite Numbers Factors Prime
Factorization (Factor Trees) Multiples Least
Common Multiple Greatest Common
Factor Divisibility Rules
2
Divisibilty Rules
3
Prime Numbers
A PRIME number is a number that has only two
factors 1 and itself. Example 2 only 1
and 2 will go into 2 3 only 1 and 3 will go
into 3 5 only 1 and 5 will go into 5
Other prime numbers are
7, 11, 13, 17, 19, 23, and many more!
4
Greatest common Factor (GCF) To find the GCF do
the following Step 1 List all the factors for
each number Step 2 Find the largest factor
these two numbers have in common Example Find
the GCF for 60 and 72 60 1, 2, 3, 4, 5, 6, 10,
12, 15, 20, 30, 60 72 1, 2, 3, 4, 6, 8, 9, 12,
18, 24, 36, 72 The largest number 60 and 72 have
in common is 12, therefore the GCF 12
5
Least Common Multiple
To find the least common multiple do the
following Step 1 List the multiples for each
number Step 2 Find the smallest number they
have in common other than zero. Example Find
the LCM for 7 and 5 7 0, 7, 14, 21, 28, 35, 42,
5 0, 5, 10, 15, 20, 25, 30, 35, 40, 45,
6
Quiz Factors

• List the factors each number. Then check your
  answer by clicking the CHECK button.
• List the factors of 8
• List the factors of 10
• List the factors of 4
• List the factors of 20
• List the factors of 16
• List the factors of 25
• List the factors of 100
• List the factors of 3

REVIEW
CHECK
7
Answers Factor Quiz

• List the factors each number. Then check your
  answer by clicking the CHECK button.
• List the factors of 8 1, 2, 4, 8
• List the factors of 10 1, 2, 5, 10
• List the factors of 4 1, 2, 4
• List the factors of 20 1, 2, 4, 5, 10, 20
• List the factors of 16 1, 2, 4, 8, 16
• List the factors of 25 1, 5, 25
• List the factors of 100 1, 2, 4, 5, 10, 20, 25,
  50, 100
• List the factors of 3 1, 3

REVIEW
Back to Quiz
8
Composite Numbers
Composite numbers are numbers that have more than
two factors. Example 4 1, 2 and 4 go into
4 6 1, 2 , 3 and 6 go into 6 8 1, 2, 4, and
8 go into 8.
9
QUIZ
Factors
Factors are numbers that go into another number.
To find the factors of a number, find the
pairs. Example Factors of 20 1 x 20
2 x 10 4 x 5 20 1, 2, 4,
5, 10, 20 Then write them in order from least
to greatest! Then write them in order
from least to greatest!
Factors of 50 1 x 50 2 x 25
5 x 5 50 1, 2, 5, 25, 50
Remember A factor will never be larger than the
number itself.
10
QUIZ
Prime Factorization (Factor Trees)
Factor Trees are used to find the PRIME
FACTORIZATION of a number.
70 35
2 5 7
Circle the number if it is prime
Prime Factorization of 70 is 2 x 5 x 7
11
QUIZ
Multiples
Multiples are all the numbers a number will go
into. Multiples are infinite! Examples Multiples
of 5 0, 5, 10, 15, 20, 3 0, 3,
6, 9, 12, 15, 18, 20 0, 20, 40, 60,
0 is the first multiple of every
number. Multiples are infinite, so you must end
each line with to show infinity.
12
Quiz Prime Factorization

• List the prime factorization for each number.
  Then check your answer by clicking the CHECK
  button.
• 72
• 50
• 100
• 90
• 20
• 15

CHECK
REVIEW
13
Answers Prime Factorization Quiz

• 72 2 x 3
• 50 5 x 2
• 100 5 x 2
• 90 3 x 5 x 2
• 20 2 x 5
• 15 3 x 5

2
3
2
2
2
2
2
Back To The Quiz
REVIEW
14
Quiz Multiples

• List the multiples for each number. Then check
  your answer by clicking the CHECK button.
• List the multiples of 8
• List the multiples of 10
• List the multiples of 4
• List the multiples of 20
• List the multiples of 16
• List the multiples of 25
• List the multiples of 100
• List the multiples of 3

CHECK
REVIEW
15
Answers Multiple Quiz

• List the multiples of 8 0, 8, 16, 24, 32,
• List the multiples of 10 0, 10, 20, 30, 40,
• List the multiples of 4 0, 4, 8, 12, 16,
• List the multiples of 20 0, 20, 40, 60, 80,
• List the multiples of 16 0, 16, 32, 48, 64,
• List the multiples of 25 0, 25, 50, 75,
  100,
• List the multiples of 100 0, 100, 200, 300,
  400,
• List the multiples of 3 0, 3, 6, 9, 12,

REVIEW
BACK TO THE QUIZ