Questões de EFAI Matemática

Fabiana went to buy marbles to play with her friends. In the toy store, the price of each marble is US$ 0.25.

Available at: https://www.shutterstock.com/pt/image-vector/set-different-colors-marble-balls-illustration-1681282891. Accessed 22 nov. 2022.

If Fabiana buys $8$ marbles, how much will she have to pay?

Juliana has a piggy bank where she only keeps $10$ and $5$-cent coins. She got a bill from her grandmother, as shown in the following image:

If Juliana exchanges the bill only for coins to keep in the piggy bank, the representation of this value will be

Lucas went to the bakery to buy a cake and paid a total of $16$ dollars and $30$ cents. As he was in a hurry, he paid with a USS$ 50.00 bill, and he didn’t check the change on the spot until he got home.

What is the correct representation of the change Lucas should receive?

A store owner has two US$ 5 bills and one US$ 20 bill in his pocket. To make it easier for his customers change, he would like to exchange all his money for US$ 1 coins.

After the exchange, how many coins will the store owner have?

Márcio is saving money in his piggy bank so he can buy a ball that costs US$ 6.00. By his calculations, he has the exact value by keeping only quarter dollar coins.

How many coins does Marcio have in his piggy bank?

Gabriela coleciona moedas de $5$ centavos. Ao todo, ela já tem o valor de R$ 2,00.

Quantas moedas de $5$ centavos Gabriela tem?