Someone please help me with these three questions. I’ll do anything

What is the value of the digit 1 in the number 13?

Mrs. morton has a special reward system for her class. when all her students behave well, she rewards them by putting 3 marbles into a marble jar. when the jar has 100 or more marbles, the students have a party. right now, the the jar has 24 marbles. how could mrs. morton reward the class in order for the students to have a party?

Ineed with this problem 21 show steps