can you answer this and show me how you got the answer?

Question

one and three fourths minus four fifths

Answer 1

1 3/4 - 4/5

first off, convert the first mixed number into an improper fraction, which would be 7/4

then, you find a common denominatior, which is 20

that gives you 35/20 - 16/20

and that is 19/20

Answer 2

1 3/4 - 4/5 =
you have to have a common denominator so use 20. Multiply the three and four in the first fraction by five. You get
1 15/20. You multiply 4/5 by 4. You get 16/20.
1 15/20-16/20.
Next you borrow a whole--which in this case is 20. You have 35/20-16/20= 19/20

Answer 3

3/4 ( 5/5 ) 15/20
-4/5 ( 4/4 ) 16/20
_____________
-1/20