Questões de EFAI Matemática

Thiago wrote three different numbers in his notebook:

What is the numerical representation of the largest number of the three above?

For the Math homework, the students need to write a number that is inside a chart in its full form. Watch this number:

The correct writing for this homework is:

Laura has a coin collection. She always counts the coins of her collection in the middle of the year. To do this, she puts the coins in small towers of $10$ each. Observe Laura’s last count:

Available at: https://www.shutterstock.com/pt/image-vector/golden-coins-set-flat-gold-icon-1891478965. Accessed 6 Dec. 2022.

How many coins does Laura have in her collection?

According to IBGE (Instituto Brasileiro de Geografia e Estatística), in $2021$ there were $2,991$ elementary schools in the city of São Paulo, which is the most extensive education network in the country.

The number of elementary schools in the city of São Paulo in $2021$ written in full is:

Valeria has an aunt who is $45$ years older than her. Today is Valeria’s $12th$ birthday.

How old is Valeria’s aunt?

Guilherme and Thais want to buy a new volleyball ball. Guilherme has US$18.00 while Thais has US$33.00. If they pool the money, they will have exactly the value of the ball they want.

How much does the volleyball ball cost?