Answer :

To divide a fraction by a fraction you multiply by the reciprocal. That means that you turn the second fraction upside-down, and multiply.
So if you have 3/8 divided by 9/16, you will end up with
3/8 * 16/9
So now you can simplify diagonally, and it becomes 1/1 * 2/3, which is the same as 1 * 2/3.  The next step would be just to multiply fractions like normal, but since we know that any number times 1 is the number, the answer is 2/3
ANSWER: 2/3
Hope this helped, and feel free to ask more questions if you need!!(:
step1:keep
        that mean you keep 3/8 normal
step2:change
         that mean you change ÷ to ×
         3/8×
step3:flip
         that mean you flip the second number
         9/16 change to 16/9
         3/8×16/9=48/72
so the answer is 48/72
remember there is 3 step:keep 
                                     change
                                     flip

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