An arrangement of objects in rows and columns. All the rows have the same number of objects. All the columns have the same number of objects.

A way to show data using the height or length of rectangles to represent how many in each group or category.

The bottom part of a fraction that tells how many equal parts the whole was partitioned into.

An operation for finding the number of groups or finding the size of each group when we share, or separate a total into groups of equal size.

The number we are dividing by, which can represent the size of the groups or the number of groups.  Example: When 37 is divided by 5, we call 5 the divisor. 

One part of a whole that is divided into 8 equal parts.

A statement that includes an equal sign (=). It tells us that what is on 1 side of the equal sign is equal to what is on the other side.

Fractions that have the same size and describe the same point on the number line. Example:  and  are equivalent fractions.

A way of writing a number as a sum of the values of the digits.

Example: 482 written in expanded form is  .

A statement that has at least 2 numbers and at least 1 math operation (such as addition, subtraction, multiplication and division).

A number that is multiplied by at least 1 other whole number to get a product.

A number used to describe the parts of a whole that has been partitioned into equal parts.

A weight unit that is part of the metric measurement system. 

There are 1,000 grams in 1 kilogram.

The part of a picture graph that tells what each picture or symbol represents.

A weight unit that is part of the metric measurement system. 

There are 1,000 grams in 1 kilogram.

A liquid volume unit that is part of the metric measurement system.

A number expressed as a whole number and a fraction less than 1. 

An operation for finding the total number of objects when we have a certain number of equal groups.

The top part of a fraction that tells how many of the equal parts are being described.

Grouping symbols that can be used in expressions or equations, such as: .

The boundary of a flat shape. We can find the length of the perimeter by finding the sum of the side lengths of the shape.

A way to show data using pictures or symbols to represent how many in each group or category.

The result of multiplying some numbers.

 A flat shape with 4 straight sides and 4 angles.

The result of dividing one number by another.

A quadrilateral with 2 pairs of parallel sides and 4 right angles.

A quadrilateral with 4 equal sides.

The angle made by 2 sides that meet like they do in a rectangle.

To say which number a given number is closer to. Example: For 182, the number 180 is the closest multiple of 10, and 200 is the closest multiple of 100. We can round 182 to 180 (if rounding to the nearest ten) or 200 (if rounding to the nearest hundred).

A number line on one side of a bar graph that tells what data value each rectangle represents.

A bar graph marked in multiples of some number other than 1.

A picture graph where each picture represents an amount other than 1.

One part of a whole that is divided into 6 equal parts.

A quadrilateral with 4 equal sides and 4 right angles.

A square with side lengths of 1 centimeter.

A square with side lengths of 1 foot.

A square with side lengths of 1 inch.

A square with side lengths of 1 meter.

A flat shape with 3 straight sides and 3 angles.

A fraction with a numerator of 1.

The amount of liquid it takes to completely fill a container.

The amount of space a liquid takes up.

How heavy something is.