28 factors to [2 2 7]
36 factors to [2 2 3 3]
Common factors are [2 2]
Answer is 1, 2 and 4
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1 2 4
Since 12 is a factor of 36, all of the factors of 12 are common to 36.
The common factors of 36 and 81 are: 1, 3, and 9
The common factors of 4 and 36 are 1, 2, and 4
To give a number in its simplest form, you need to identify any common divisors between the denominator and numerator. In this case, both 36 and 28 divide by 4. If we do this, we get 9/7. 9 and 7 have no common factors, and so 36/28 in its simplest form is 9/7.