The primary factors for 70 is 2 x 5 x 7. In other words, 70 can be expressed as a product of its primary factors which are 2, 5, and 7. 70 can be written as a product of its divisors 2, 5, and 7 is known as prime decomposition of 70. These prime factors are the building blocks that compose the number 70. By performing the process of prime factorization on 70, we can determine that 2, 5, and 7 are its main elements. Basically, we are breaking down the number 70 into its component prime factors. Breaking down the number 70 into its prime divisors 2, 5, and 7 is called finding the prime factors of 70. By doing this we are representing 70 as a product of its fundamental elements.