Learn what an exact number is in chemistry, physics, and math. Get the definition and examples of exact numbers.
Mathematics
Learn how to convert degrees to radians and back again. This is a key angle conversion in geometry and trig.
How to Convert Degrees to Radians – Angle Conversion
Learn what the absolute value or modulus of a number is in math. Get examples and see how to solve absolute value equations.
What Is Absolute Value? Definition and Examples
Learn what a prime number is and see how to tell if a number is prime. Get a list of primes under 100 and 1000.
What Is a Prime Number? How to Tell If a ...
Learn what a real number is in math. Get examples of numbers that are real versus those that are imaginary.
What Is a Real Number? Definition and Examples
Learn what infinity is in math. Get interesting infinity facts and examples. Learn the properties of this "number".
What Is Infinity? Infinity Facts and Examples
Learn how to calculate percentage increase or decrease. See examples of percentage change and how to interpret them.
How to Calculate Percentage Increase or Decrease (Percentage Change)
Learn about equivalent equations in algebra. See how to recognize and solve them and learn the rules for writing them.
Equivalent Equations in Algebra
Get interesting circle facts. See how to find the area, circumference, diameter, and radius of a circle in geometry.