Definition
The branch of mathematics that deals with the basic operations performed on numbers: addition, subtraction, multiplication, and division.
Plain English
Working with numbers using the four basic operations: adding, subtracting, multiplying, and dividing.
Context Anchor
Pilots use arithmetic when checking fuel, time, distance, aircraft loading, and simple flight-planning numbers.
Derivation
From the Greek arithmetike, meaning 'the art of counting,' from arithmos meaning 'number.' This is why arithmetic is the foundation of all number-handling in aviation, from simple time-distance problems to balancing the aircraft.
Why Pilots Care
Accurate arithmetic prevents critical errors in fuel reserves, takeoff distances, and center-of-gravity limits that directly affect flight safety.
Intuition Check
Arithmetic does not mean advanced mathematics here. It means the basic number work a pilot uses to make safe, practical decisions.
Example Sentence 1
The pilot used simple arithmetic to add the weight of fuel, passengers, and baggage before takeoff.
Example Sentence 2
During preflight the student used arithmetic to add the weights of fuel, passengers, and baggage to confirm the total stayed under limits.