I guess you mean:
17/15
------
13/15
which is the same as:
17/15 ÷ 13/15
First: convert the mixed number to an improper fraction, then change the divide to multiply and invert the second fraction; do the multiplication and convert any improper fraction to a mixed number:
17/15 ÷ 13/15 = 22/15 ÷ 13/15
= 22/15 x 15/13
= 22/13
= 19/13
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21 / 45 = 7 / 15 seven fifteenths 7 over 15
3/7 x 13/15 = 39/105 = 13/35 Multiply the numerators and multiply the denominators: 3 x 13 = 39 7 x 15 = 105
The answer is fifteen over seven
Eleven fifteenths minus ten fifteenths is equal to one fifteenth.
Expressed as a proper fraction in its simplest form, 3/15 + 12/18 = 13/15 or thirteen fifteenths. Expressed as a decimal, this is equal to 0.86 recurring (that is, 0.86666...)