Glossary
Grade 1
a fourth
One of the pieces created when a shape is split into 4 equal parts.
A fourth, or a quarter, of the square is shaded.
a half
One of the pieces created when a shape is split into 2 equal parts.
A half of the rectangle is shaded.
data
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
difference
The result when a number is subtracted from another.
Example:
The difference is 3.
Example:
The difference is 3.
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.
half past
When the time is halfway through one hour.
When the minute hand is pointing at the 6.
Example:
When the minute hand is pointing at the 6.
Example:
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:
This sneaker is 15 cubes long. Its length is 15 cubes.
This sneaker is 15 cubes long. Its length is 15 cubes.
o’clock
When the time is at the start of an hour.
The minute hand on a clock points to 12.
Example:
The minute hand on a clock points to 12.
Example:
teen number
A number with 1 ten and between 1 and 9 ones.
Example:
15 is 1 ten and 5 ones.
15 is a teen number.