1 corner 10 pieces
10 pentagonal tablet
1 5 yuan.
5 yuan II.
10 yuan 5 pieces.
100 yuan 1 sheet
teaching
Take out a dollar coin: how much is this, students?
. . .
Take out a five-dollar bill: how much is this, students?
. . .
All right. Who says a few one-dollar coins are as valuable as five-dollar bills?
. . .