Unit Fractions
Unit Fractions is a Grade 3 math skill from Eureka Math defining the two key vocabulary terms: fractional unit and unit fraction. The fractional unit is the name for the equal parts a whole is divided into (thirds, fourths, eighths). A unit fraction is one of those equal parts, written as 1/d where d is the total number of equal parts. For example, when a whole is divided into 5 equal parts, each part is the unit fraction 1/5 and the fractional unit is fifths. This vocabulary is essential for naming, comparing, and operating with all fractions.
Key Concepts
The fractional unit is the name for the equal parts a whole is divided into (e.g., thirds, fourths). A unit fraction is one of these equal parts, written as $\frac{1}{d}$, where $d$ is the total number of equal parts.
Common Questions
What is a unit fraction?
A unit fraction is one equal part of a whole, written as 1/d where d is the total number of equal parts the whole is divided into. Examples: 1/2, 1/3, 1/4, 1/8.
What is a fractional unit?
A fractional unit is the name for the type of equal parts—such as halves, thirds, fourths, or fifths. It tells you how many parts make one whole.
What is the difference between a unit fraction and a fractional unit?
A unit fraction is the written fraction (1/5). A fractional unit is the word describing the parts (fifths). They describe the same concept in different forms.
How do unit fractions build toward larger fractions?
Any fraction with numerator greater than 1 is made up of multiple unit fractions. For example, 3/4 = 1/4 + 1/4 + 1/4 — three copies of the unit fraction 1/4.
In which textbook are Unit Fractions taught?
This skill is taught in Eureka Math, Grade 3.