Grade 1Glossary
 a fourth
 Unit 7 Lesson 10
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
 Unit 7 Lesson 10
One piece of a shape split into 2 pieces that are the same size.
A half of the rectangle is shaded.
 category
 Unit 1 Lesson 7
A label that tells how objects in a group are alike.
 data
 Unit 1 Lesson 9
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
 Unit 1 Lesson 5
The result when one number is subtracted from another.
 estimate
 Unit 4 Lesson 2

To find a value that is close to the correct value.
 fourths
 Unit 7 Lesson 9
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
 Unit 4 Lesson 14, Unit 4 Lesson 17
63 is greater than 32.
63 > 32 halves
 Unit 7 Lesson 9
The pieces created when a shape is split into 2 pieces that are the same size.
The circle is split into halves.
 length
 Unit 6 Lesson 5
The measure of how long an object is in samesized units with no gaps or overlaps.
Example: The length of this sneaker is 15 cubes long.
 less
 Unit 4 Lesson 14, Unit 4 Lesson 17
 o’clock
 Unit 7 Lesson 13, Unit 7 Lesson 14
The clock shows 2 o’clock or 2:00.
 sum
 Unit 1 Lesson 2
The total when two or more numbers are added.
 survey
 Unit 1 Lesson 9
A way to collect data using a group of people answering the same question.
 teen number
 Unit 3 Lesson 8
A number with 1 ten and between 1 and 9 ones.
Example:
Fifteen is 1 ten and 5 ones. twodigit number
 Unit 4 Lesson 7