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 same-sized 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.

two-digit number
Unit 4 Lesson 7