The basic idea is to find a common factor between the two numbers, then divide both by this factor. In this case, it is quite obvious: since both numbers end with 0, both are divisible by 10.
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20/70 = 2/7
20/70 simplifies to 2/7
It is 2/7 in its simplest form
47/70 is in its simplest form.
4 over 70 in the simplest form is 2 over 35