Math Pre-algebra Arithmetic properties Rational and irrational numbers 3 videos 2 skills More numbers than you probably imagine can be represented as the ratio of two integers. We call these rational numbers. But there are also really amazing numbers that can't. As you can guess, we call them irrational numbers. 5:55 Introduction to rational and irrational numbers VIDEO 5:55 minutes 2:18 Recognizing irrational numbers VIDEO 2:18 minutes Recognizing rational and irrational numbers PRACTICE PROBLEMS 3:36 Approximating irrational number exercise example VIDEO 3:36 minutes Comparing irrational numbers with a calculator PRACTICE PROBLEMS Use a calculator to find the approximate decimal values of irrational numbers.