Numberphile
Sounds of Pi
Listen to the beautiful musical compositions of ... pi? Pupils watch a video in the Numberphile "Pi" series that explains how people can use pi to compose a musical score. The video portrays a guitarist playing the first few notes of the...
Curated OER
Rational and Irrational Numbers
Irrational, rational, and terminating numbers are all covered in this math tutorial. The instructor uses a question from a math test to work through, showing how to compute and evaluate each answer to determine if the number given in...
Curated OER
What's a Real Number?
A real number is any number that you can find on a number line. This includes rational and irrational numbers, which means positive numbers, negative numbers, decimal numbers, square root numbers and even pi.
Curated OER
What's an Irrational Number?
This video defines rational numbers. Through the definition and examples, learners should comprehend that irrational numbers are numbers that cannot become simple fractions. The video uses examples of very common irrational numbers, such...
Curated OER
How Do Different Categories of Numbers Compare To Each Other?
The teacher defines and writes a list of the different categories of numbers. But sometimes it's hard to keep all that organized. So she draws a diagram and explains further how the categories of numbers compare or relate to each other....
Curated OER
How Do You Find the Volume of a Sphere?
The formula for the volume of a sphere is volume equals four-thirds pi times the radius cubed. That's a mouth-full. But if you are given the radius value of the sphere, all you have to do is plug it in and do the arithmetic. Just...
Curated OER
How Do You Find the Surface Area of a Sphere?
What do a basketball, a bowling ball, and a ping pong ball all have in common? They are spheres. So how do you measure the surface area of a sphere? Yes, there is a formula and all you have to do is know one measurement of the sphere to...
Massachusetts Institute of Technology
Mit: Blossoms: Rational Versus Irrational Numbers
The scope of this video lesson consists in studying the sets of Rational and Irrational numbers. The main objectives for the students are: 1) Learning how to distinguish between a rational number and an irrational number; 2) Learning...
Khan Academy
Khan Academy: Algebra: Square Roots and Real Numbers
This resource explains how to find the square root of real numbers using their prime factorizations and labeling the results as rational or irrational. [10:19]
Math Planet
Math Planet: Perfect Squares and Square Roots
Students learn how to approximate square roots through class notes and a video lesson.
Virtual Nerd
Virtual Nerd: What's an Irrational Number?
An irrational number is a number that cannot be written as a fraction. View this tutorial to see some examples and learn the definition and an important property of these special numbers. [2:06]
Khan Academy
Khan Academy: Comparing Irrational Numbers With Radicals
Learn how to sort irrational numbers with radicals from least to greatest without using a calculator. [5:28]
Khan Academy
Khan Academy: About Pi and Tau: Rhapsody on the Proof of Pi = 4
This video explores properties of circles and what is wrong with the proof that pi is equal to four.
Sophia Learning
Sophia: Irrational Numbers
Irrational numbers are defined and explored in this video lesson. Examples are included in the tutorial.
Sophia Learning
Sophia: Irrational Numbers
The mathematics resource includes a video lesson that explores irrational numbers. The square root of two and pi are included.
Math Mammoth
Math Mammoth: How to Convert Fractions to Decimals
This lesson introduces how to change fractions into decimals. Also explains the difference between rational and irrational numbers. [10:26]
Sophia Learning
Sophia: Irrational Numbers
Explore and determine how to recognize an irrational number and assess learning with a quiz.
Other
Algebra2go: Classifying Real Numbers
In this video tutorial, Professor Perez uses a real number line to demonstrate integers, natural numbers, rational and irrational numbers, and whole numbers. [8:17]
Study Pug
Study Pug: Understanding the Number Systems
Numbers can be categorized more specifically into different number systems, for instances, natural numbers, whole numbers, integers, rational numbers, and irrational numbers. In this video, you will learn how to classify numbers into...
Khan Academy
Khan Academy: Classifying Numbers: Rational and Irrational
Given a set of numbers, learn how to tell which are rational and which are irrational. [2:17]
Khan Academy
Khan Academy: Intro to Rational and Irrational Numbers
Explains what rational and irrational numbers are and the difference between them. [5:55]
Khan Academy
Khan Academy: Comparing Irrational Numbers With Radicals
Learn how to sort a bunch of numbers from least to greatest without using a calculator.
Khan Academy
Khan Academy: 9.999... Reasons That.999... = 1
Point nine repeating equals one! 9.999...reasons in 9.999...minutes. Bonus points if you can name all 9.999...lords a-leaping.
Sophia Learning
Sophia: Estimating Square Roots: Lesson 2
Here, the student will be shown how to estimate the value of a root when they are not taking the root of a perfect square. This lesson is 2 of 9 in the series titled "Estimating Square Roots."