Count : To count means to find out the number of objects by adding one for every object.

Hour : A unit for measuring time equal to 60 minutes.

Hundred : Hundred refers to the number 100.

Hundredth : Hundredth refers to the number $\frac{1}{100}=0.01=10^{-2}.$

Percentage : A percent or $\%$ is equal to $\frac{1}{100}.$ The phrase x percent of y means the product $\frac{x}{100}\cdot y.$

Area : The amount of unit squares that is needed to cover a 2-dimensional shape.

Centimeter : A centimeter ($cm$) is $\frac{1}{100}$ of a meter.

Half : A Half is the number equal to $\frac{1}{2}=0.5.$

Length : Length is the attribute of a one-dimensional shape that can be measured with a measuring tape.

Product : A product is the result of a multiplication.

Right angle : A right angle is an angle equal to $90^{\circ}.$

Right triangle : A right triangle is a triangle that has a right angle. The sides that form the right angle are called legs, the third side is called hypotenuse. The area of a right triangle is half the product of the lengths of the two legs. The Pythagorean theorem is an important theorem for right triangles that allows to calculate the third side of a right triangle given the other two.

Square centimeter : Square centimeter or $cm^2$ is a unit of measurement for measuring area. 1 square centimeter is the area of a square with side length 1 $cm,$ so 10,000 $cm^2$ are one $m^2.$