Write the number as a product of primes. See Example 1.
EXAMPLE 1 Write each of the following numbers as a product of primes.
a. 40
b. 63
Solution
a. First, write 40 as the product of any two whole numbers other than 1.
40 = 4 · 10
Next, factor each of these numbers. Continue this process until all of the factors are prime numbers.
All the factors are now prime numbers. Then 40 written as a product of primes is
40 = 2 · 2 · 2 · 5
b.
20
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