1.)When you are finding a fraction or decimal of something, then you need to is this × ?

2.)When you are finding a percent of a number or price, you need to convert the percent to a

__decimal___ first and then the number or price by that
​

Answer asap and if you do you will get brainliest. catherine buys a gallon of ice cream from the store. after taking it home, she eats a fifth of a gallon of ice cream. her sister eats some of the ice cream as well. if two-thirds of the original amount of ice cream is left, then what fraction of a gallon of ice cream did her sister eat?