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Name:_________________________
11/4
Notes on Prime and Composite Numbers
A prime number has only ___ factors: 1 and itself. A composite number has more
than two factors. The number ___ is neither prime nor composite. The prime numbers
between 2 and 31 are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29 and 31 since each of these
numbers has only two factors, itself and 1.
List the factors of each number. Then, circle whether the number is prime or composite.
a. 5
Factors __________________
Prime or Composite
b. 12
Factors __________________
Prime or Composite
c. 13
Factors __________________
Prime or Composite
d. 9
Factors __________________
Prime or Composite
e. 15
Factors __________________
Prime or Composite
f. 7
Factors __________________
Prime or Composite
g. 22
Factors __________________
Prime or Composite
h. 19
Factors __________________
Prime or Composite
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