When you divide a fraction by a fraction, you have to multiply the first number by the reciprocal of the second.
2/7 divided by 5/9
2/7 multiplied by 9/5
Then you multiply the numerators (the top numbers) together and the denominators (the bottom numbers) together to give you the final answer.
2 x 9 and 7 x 5
= 18/35
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-5/12 divided by 15/7 = -7/36
It is: 9/7 divided by 5/81 = 729/35
7.4
7.4
7/8 divided by 2/3 = 15/16