2, 3, 5,
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The way to be sure you have one of these is to take any three distinct prime numbers and multiply them. Those three prime numbers are then the only factors the product can have. An example is the number 30, which has factors of 2, 3 and 5.
Factors are prime numbers. The primes hidden in the number 30 are: 2,3, and 5.
no, they both have 5 as factors
To find the HCF of 20 and 30, break them down into their prime factors: 20 = 2x2x5 30 = 2x3x5 The next step is to identify any common prime factors. In this case both numbers have a 2 and a 5 as prime factors. Multiply these together and you get: 2x5 = 10 Therefore the HCF of 20 and 30 is 10.
20 = 2 x 2 x 5 30 = 2 x 3 x 5 Common prime factors: 2 and 5.