Questões de EFAI Matemática

Valéria owns a bakery and every morning she takes a bag with coins to her store to make the change easy for her clients. She observed that, today, there were forty-five hundredths of a dollar in her bag.

What is the value in her bag, in dollars?

In a stage of the Mathematics competition, each team needs to decompose a number correctly. Each member of the group takes a number and must place it in the right colored space. Note the round a member of the group is on:

He got the number:

What is the color of the space he should place this number in to correctly fill the decomposition?

Look at a number line divided into $10$ equal segments with four points $A,B,C$, and $D$ marked in different places:

The number $0.27$ is closest to which letter?

Gilberto works at an electronics store. He received three boxes measuring $55cm$ each today. To organize them, he decided to stack the boxes one on top of the other.

How tall is the stack of boxes?

There is a circular area that will be painted in the school square. It was divided into eight equal parts, as shown in the following image.

$3$ pieces of this square will be painted, that is, $0.375$ of the total area.

How can you tell in full the decimal representing the painted part of the square?

In a competition, all participants will share the prize equally in any case – for the participants who won and for the ones who lost. There were eight participants in the competition in total.

The fraction that each participant will get from the prize is equal to: