The prime factors regarding 70 is 2 x 5 x 7. Put simply, 70 can be expressed as a product of its prime factors that are 2, 5, and 7. 70 can be written as a product of its prime factors 2, 5, and 7 is known as prime decomposition of 70. Such prime factors are the building blocks that make up the number 70. By performing the process of finding the prime factors on 70, we can determine that 2, 5, and 7 are its main elements. Essentially, we are splitting down the number 70 into its component fundamental factors. Decomposing the number 70 into its primary factors 2, 5, and 7 is called finding the prime factors of 70. By doing this we are expressing 70 as a product of its prime factors.