Read a story about Mary. Answer questions

“Mom, what is this worth?” Mary raised her arm so her mom could see the one-dollar bill in her hand.

“That’s a one-dollar bill. I don’t think I have taught you how to count money, have I?” asked Mary’s mom.

“No, you haven’t. Can you teach me how to count money today?” asked Mary.

“Sure. Do you see the numbers on these paper bills? If it says 1, it is one dollar. It it says 10, it is ten dollars,” explained Mary’s mom.

“OK, what about coins?” asked Mary, taking out all different sizes of coins from her pocket.

“Coins can be 1 cent, 5 cents, 10 cents or 25 cents. They have different names, too. A penny is 1 cent, a nickel is 5 cents, a dime is 10 cents and a quarter is 25 cents. Do you understand?” asked Mary’s mom.

“The names for the coins sound new to me” said Mary.

“Why don’t we do some practice? If I have two quarters, how much do I have?” asked Mary’s mom.

“A quarter is 25 cents. So 25 cents plus 25 cents is 50 cents,” said Mary.

“Very good. Mow imagine I go to a supermarket and buy two bags of apples. One bag of apples cost 1 dollar and 50 cents. I have 10 dollars in my pocket. How much should I get for change?” asked Mary’s mom.

Mary wrote down the number 10 dollars and 1.50 dollars. The she multiplied 1.50 dollars by 2. Then she subtracted her answer from 10 dollars.

“Seven dollars!” exclaimed Mary.

“You got it. Counting money is not that hard, is it?” said her mom.

“No. Not at all!” replied Mary.

What did Mary’s mom teach her daughter?