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The prime numbers that are factors of 20, 30, 40, 50, and 60 are 2 and 5. These numbers are prime because they are only divisible by 1 and themselves. When you Read more Math and Arithmetic +1 What is the greatest common factor of 333 and 1000 ? Asked by Wiki User Well, honey, the greatest common factor of 333 and 1000 is 1. Those numbers don’t have any common factors other than 1 because 333 is a prime number and 1000 is Read more Math and Arithmetic +2 What is the HCF of 90 and 126 ? Asked by Wiki User The Highest Common Factor (HCF) of 90 and 126 is the largest number (...)