# Fractions / Units Other Than a Unit Square

Activity 14 of 15
This lesson helps students to understand the importance of the unit by approaching fractions using area models.

## Planning and Resources

Objectives
Students understand that fractions can only be compared if they refer to the same whole. They also recognize that fractions can only be added or subtracted if they refer to the same whole.

Vocabulary
unit fraction
equivalent fraction

Standard:

## Lesson Snapshot

#### Understanding

A fraction makes sense only if it refers to a particular scale or unit. One half of a unit square can represent different areas depending on the size of the unit. If two unit squares do not have the same scale, a unit fraction will not have the same size area.

### What to look for

Students should reflect on what they know about equivalent fractions, comparing fractions, and adding and subtracting fractions, noting that these operations only make sense if the fractions represent the same whole.

### Sample Assessment

A box of granola bars contains 18 bars. How many bars will be in (2/3) of the box?