Definition
A fraction made up of two whole numbers, one written above the other and separated by a line, where the top number (numerator) shows how many parts are being counted and the bottom number (denominator) shows how many equal parts the whole is divided into. Examples include 1/2, 3/4, and 5/8.
Plain English
A regular fraction with a whole number on top and a whole number on the bottom, like 1/2 or 3/4.
Context Anchor
Seen in basic aviation math, especially when working with measurements, conversions, weight-and-balance problems, and performance examples.
Derivation
From Latin 'simplex' meaning 'single' or 'uncomplicated,' and 'fractio' meaning 'a breaking.' A simple fraction is the most basic form of a 'broken' number — just one whole number over another, with nothing more complicated going on.
Why Pilots Care
Pilots use fractions when reading or calculating parts of measurements, fuel amounts, distances, and weights. Misreading a simple fraction can make a calculation too high or too low.
Analogy
A simple fraction is like saying you used 3 slices out of a pizza cut into 4 equal slices: 3/4.
Intuition Check
Simple does not mean the problem is easy. Here, simple means the number is written as one top number over one bottom number, such as 5/8.
Example Sentence 1
The mechanic selected a 3/8 inch wrench, reading the simple fraction stamped on the tool.
Example Sentence 2
The pilot used a simple fraction to estimate remaining fuel after the cross-country leg.