write two quarters and a dime as a fraction of a dollar
They are 70/100, a fraction which can be simplified, if required.
The fraction 1/1 = 1
10 pennies in a time so a penny is 1/10 of a dime.
10/100 or 1/10
The American dime is equal to ten cents, or one tenth of a dollar.
It is 10/25, which can be simplified if required.