The Number System
Video Lesson: Rational and Irrational Numbers
In this video, Khan Academy teaches you what rational and irrational numbers are and how to tell them apart.
Video Lesson: Number Comparison
Khan Academy shows how to sort irrational numbers with radicals from least to greatest without using a calculator.
Rational or Irrational:
Practice identifying rational and irrational numbers.
Estimation:
Practice estimating the closest rational value to an irrational number.