## Glossary

a fourth

One piece of a shape split into 4 pieces that are the same size.

A  fourth, or a quarter, of the square is shaded.

a half

One piece of a shape split into 2 pieces that are the same size.

A half of the rectangle is shaded.

category
A label that tells how objects in a group are alike.

data
Information about the things or people in a group.

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.

difference
The result when one number is subtracted from another.

estimate

To find a value that is close to the correct value.

fourths

The pieces created when a shape is split into 4 pieces that are the same size.

The circle is split into fourths, or quarters.

greater than

63 is greater than 32.
63 > 32

half-past

This clock shows half-past 4 o’clock or 4:30.

halves

The pieces created when a shape is split into 2 pieces that are the same size.

The circle is split into halves.

length

The measure of how long an object is in same-size units with no gaps or overlaps.

Example: The length of this sneaker is 15 cubes long.

less than

32 is less than 63.
32 < 63

o’clock

The clock shows 2 o’clock or 2:00.

sum
The total when two or more numbers are added.

survey
A way to collect data using a group of people answering the same question.

teen number

A number with 1 ten and between 1 and 9 ones.

Example:
Fifteen is 1 ten and 5 ones.

two-digit number