## Glossary

**array**

An arrangement of objects in rows and columns. Each column must contain the same number of objects as the other columns, and each row must have the same number of objects as the other rows.

**a third**

One piece of a shape split into 3 pieces that are the same size.

A third of the rectangle is shaded.

**bar graph**

**centimeter**

A length unit in the metric measurement system. There are 100 centimeters in a meter.

**column**

**compose**

**data**

Example: If you have a box of colored pencils, then the lengths and colors of each of the pencils are data about the pencils in the box.

**decompose**

**even**

**expanded form**

A specific way of writing a number as a sum of hundreds, tens, and ones.

Expanded form writes a number as a sum of the value of each digit. Example: 482 written in expanded form is \(400 + 80 + 2\) .

**face**

**foot**

A length unit in the U.S. customary measurement system.

There are 12 inches in a foot.

**hexagon**

A shape with 6 sides and 6 corners.

**inch**

A length unit in the U.S. customary measurement system.

There are 12 inches in a foot.

**line plot**

**meter**

A length unit in the metric measurement system.

There are 100 centimeters in a meter.

**number line**

A diagram that represents numbers as lengths from 0 using equally spaced tick marks or points.

**odd**

**pentagon**

**picture graph**

**quadrilateral**

**row**

In an array, a row goes side to side.

**thirds**

The pieces created when a shape is split into 3 pieces that are the same size.

This circle is split into thirds.