Number Sense and Operations
Lesson 4
Prime Numbers & Factors
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A prime number is a whole number with exactly two divisors, 1 and itself. The number 1 is not a prime, since it has only one divisor.
One way to visualize all the factors of a number is to use a factor rainbow.
Prime factorization breaks down a number’s factors into PRIME NUMBERS. This can be done using a factor tree.
Identify each number as a prime number or a composite number. If the number is composite, list all of its factors.
48
29
36
120
2) Fill in the blanks using only prime numbers.
_________ x _________ = 6
_________ x _________ = 35
_________ x _________ = 30
3) Find all the factors of
9
17
40
4) Find the prime factors of
54
104
66
81
5) Determine the prime factors of a three-digit number or four-digit number of your choice.
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