Respuesta :

Googleawesomecool
First you have to make the denominators the same so the fraction for 17/18 is going to be 85/90
Multiply the denominator and numerator by 5

Next you have to do the same thing with 4/5 to make it have the same denominator so you have to multiply the denominator and numerator by 18
72/90
Subtract 85/90 by 72/90 will be 13/90
garybgajiton

Answer:

13/90

Step-by-step explanation:

17/18 - 4/5 (we need to make both the denominators the same, so we'll need to do the cross multiplying method)

17  ×   5          85          

_______ = _____       (multiply)

18  ×   5          90

4   ×  18        72

_______ = ____  (multiply)

5   ×  18        90

Now that we have  the same denominators let's subtract the numerators. (remember, the denominator always stays the same)

85        72         13

___  _  ___ =  ____   (13/90 is already in a simplified form)

90        90        90

So our final answer id 13/90

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