Glossary
Grade 2
One of the pieces created when a shape is split into 4 equal parts.
A fourth, or a quarter, of the square is shaded.
One of the pieces created when a shape is split into 2 equal parts.
A half of the rectangle is shaded.
One piece of a shape when the shape is split into 3 pieces that are the same size.
A third of the rectangle is shaded.
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.
A metric unit of length.
Examples:
A paper clip is about 1 centimeter wide.
A staple is about 1 centimeter long.
A pinkie finger is about 1 centimeter wide.
To put a number or shape together using its parts.
Examples:
Compose 1 ten from 10 ones.
Compose 14 from 1 ten and 4 ones.
Compose 1 rectangle from two triangles.
Examples:
Compose 1 ten from 10 ones.
Compose 14 from 1 ten and 4 ones.
Compose 1 rectangle from two triangles.
A collection of facts, such as numbers, measurements, or observations.
Examples:
the color of each pencil in a box
the number of pencils sold each day
the length of each pencil in a box
Examples:
the color of each pencil in a box
the number of pencils sold each day
the length of each pencil in a box
To break apart a number or shape into its parts.
Examples:
Decompose 1 ten into 10 ones.
Decompose 14 into 1 ten and 4 ones.
Decompose 1 rectangle into 2 triangles.
Examples:
Decompose 1 ten into 10 ones.
Decompose 14 into 1 ten and 4 ones.
Decompose 1 rectangle into 2 triangles.
A number that can be split into 2 equal-size groups or made into pairs without any objects left over.
A way of writing a number as a sum of the values of the digits.
Example: 482 written in expanded form is \(400 + 80 + 2\).
Example: 482 written in expanded form is \(400 + 80 + 2\).
A U.S. unit of length.
Examples:
A ruler is 1 foot long.
A notebook is about 1 foot long.
A football is about 1 foot long.
Examples:
A ruler is 1 foot long.
A notebook is about 1 foot long.
A football is about 1 foot long.
The pieces created when a shape is split into 4 pieces that are the same size.
The circle is split into fourths, or quarters.
The pieces created when a shape is split into 2 pieces that are the same size.
The circle is split into halves.
A U.S. unit of length.
Examples:
A paper clip is about 1 inch long.
A quarter is about 1 inch wide.
The side of a connecting cube is about 1 inch long.
Examples:
A paper clip is about 1 inch long.
A quarter is about 1 inch wide.
The side of a connecting cube is about 1 inch long.
A way to show data with Xs or other marks above a number line. Each mark represents 1 number or 1 measurement.
A metric unit of length.
Examples:
A baseball bat is about 1 meter long.
A yardstick is about 1 meter long.
A door is about 1 meter wide.
Examples:
A baseball bat is about 1 meter long.
A yardstick is about 1 meter long.
A door is about 1 meter wide.
A number is odd if that number of objects cannot be split into two equal groups or made into pairs without any objects left over.
A way to show data using pictures or symbols to represent how many in each group or category.