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Prime factor each number and choose the common factors to multiply.
85=5x17
155=5x31
5 is the greatest common factor.

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Q: Write down the highest common factor of 85 and 155?
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The highest common factor of 34 and 58?

To find the highest common factor you first need to break the numbers down into their prime factors. In this case 34 and 58 are broken down as follows: 34 = 2x17 58 = 2x29 The next step is to identify any common prime factors. In this case, the only common prime factor is a single 2. Therefore the highest common factor of 34 and 58 is 2.


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