Hot Math Posts — Page 4 of 45 « Math

How To: Add 3 fractions with common denominators

In this math tutorial the instructor shows us how to add three fractions with common denominators. He says that it is similar to adding two fractions with common denominator. He tells us first to add all the numbers in the numerator which gives us a new number which is the numerator in our answer and the denominator to our answer is the original common denominator. Now, if the resulting fraction is improper fraction, you will have to convert it into a mixed number. In this video the author sh...

How To: Find a missing part of a triangle, similar to another

In this tutorial the author shows how to find out the missing part of a triangle that is similar to another triangle. He explains the concept of similar triangle diagrammatically by showing that similar triangles have similar angles and parallel sides. Now he labels sides of similar triangles and marks the value of unknown side as variable x. Now in similar triangles as the lengths of sides of proportionate he shows how to write a equation of proportion and solves it finding the missing part ...

How To: Apply the fundamental rule of proportions

Learn how to apply the fundamental rule of proportions just follow simple few steps. First step is take two fractions and equate them. For example (Top/Bottom)=(Top/Bottom).

How To: Add and subtract variables

Math Problem Generator gives a video about how to add and subtract variables. All you have to do is combine the coefficient, which is the number that comes before the variable. The numbers are added or subtracted but the variable remains the same. In the video, the example given is 9x + 6x - x. First you add 9x + 6x, giving you 15x. The equation is now 15x - x. If a variable has no number written in front of it, that means the value is 1. So the equation is 15x - 1x and that is equal to 14x.

How To: Do a fun fast multiplication trick

This how-to video is about multiplying numbers in a very quick and in a new manner. Multiplication of two - 2 digit number is explained in this video, To do this multiplication we need to follow three steps, let's follow this method with an example, let's say that we want to multiply 23 with 46, let's write the numbers like this, 23*46 (multiplying 23 with 46), the answer is 1058.

How To: Find the volume of a cone quickly

For people who are interested in math or who need to know how to find the volume of a cone for any reason, whether it be homework or architecture, this video will show you how to do so. The formula for finding the volume of a cone is (1/3) pi x radius^2 x height. You can find the radius of your cone by finding half the length across the center of the circle which is the cone's base. After plugging in all the values into this equation, you will be able to find the volume of any cone when given...

How To: Identify the slope and Y-intercept given y=mx+b

This tutorial shows how to identify the slope and y-intercept given the formula y=mx+b. In this formula m is always going to be the slope and b is always going to be the y-intercept. Therefore if your given a problem like the one displayed in this video: y= 8/3x + 9, the slope would be 8/3 and the y-intercept would be 9. When given these problems all you have to do is match the given numbers to the formula to find the slope and y-intercept.

How To: Apply the 5th Law of Exponents

In this video the tutor explains the 5th Law of Exponents. He reminds the viewer that when polynomials are multiplied, their exponents get added. Now he states that when a polynomial is raised to another power, the exponents are multiplied instead of adding. The 5th Law of Exponents states that when a polynomial with a power 'a' is raised to a power 'b', then the final power of the exponents is the value of the product of the exponents, i.e., a * b. This video states the 5th Law of Exponents ...

How To: Solve for X (advanced)

The video describes how to find 'x' in the algebraic equation -3x + 7x - 6 = 30

How To: Reduce fractions for easier manipulation

You should always try to reduce a fraction until it can't be reduced anymore. To do this, look at your fraction and figure out the greatest number BOTH the numerator and denominator can be divided by. This is called the GCF - the greatest common factor. In the video, the problem you must solve is (15/18). What number can be divided into both 15 and 18 evenly? The answer is 3.

How To: Calculate percentage

Not sure exactly how to calculate a twenty percent tip for your waitress? Or how about how to figure out how much less your cost will be with that thirty percent off tag? Use these steps to calculate percentage, without a calculator.

How To: Play with a Mobius Strip & topology tricks

This was a three flip mobius strip with one surface that yields a loop with 8 twists. It takes 6 lines to flatten it which leads to 7 zones, one less than the number of resulting twists.

How To: Add Mixed Numbers Tutorial

This step by step video teaches how to add mixed numbers AKA mixed fractions easily!

How To: Convert a Mixed Number to an Improper Fraction Tutorial

This easy tutorial will show you how to convert a mised number into an improper fraction in a few easy steps.

How To: Divide Fractions Tutorial

An easy step by step video tutorial on dividing fractions.

How To: Multiply Fractions Easy Tutorial

In this step by step video I'll show you how to multiply fractions.

How To: Subtract Fractions with Unlike Denominators Step by Step

Learn how to subtract fractions with unlike denominators by watching this easy video tutorial.

How To: Subtract Fractions with Like Denominators

This easy video tutorial teaches how to subtract fractions with like denominators step by step.

How To: Add Fractions with Unlike Denominators Tutorial

This video tutorial teaches you step by step how to add fractions with unlike denominators.

How To: Add Fractions Tutorial

Learn how to add fractions with this easy step by step video.

How To: Solve Word Problems Involving Volume of a Pyramid

Learn how to solve geometry word problems. For example, how would you solve the following problem?

How To: Use a Venn Diagram to Solve Probability Problems

Video covering how to set up a Venn diagram. The video covers how to draw the diagram and then look at a set of data and place the data in the correct part of the Venn diagram. The sample problem is as follows.

How To: Find the Height of a Trapezoid.

Step by step directions for finding the height of a trapezoid. Video: .

How To: Find the Area and Volume of a Hemisphere

A hemisphere is sphere that has been cut in half. When you cut the sphere in half you are left with the great circle, plus half of a sphere. This fact can be used to find the area, and the volume of a hemisphere. The video works several example problems in which the area and volume of a hemisphere is calculated.

How To: Multiply by 11 Faster Than a Calculator

Yes, with this simple technique you can multiply 2 digit numbers in your head. The video also reviews a really easy method for multiplying larger numbers by 11 in a simple fashion.

How To: Multiply Any Number by 11 Easily

This video shows two techniques for multiplying any number by 11. Using these techniques you will find it is easier than using a calculator.

How To: Find the Radius of a Circle from Arc Length

The video provides two example problems for finding the radius of a circle given the arc length. Problem one finds the radius given radians, and the second problem uses degrees.

How To: Find the Surface Area of a Cylinder.

Step by step directions for finding the surface area of a cylinder. In order to calculate the surface area of the cylinder you find the area of the two bases and add this to the lateral area.

How To: Find the Volume of Composite Figures (Also Called Composite Shapes)

Composite figures are composed of several geometric shapes and are three-dimensional shapes. The first composite shape is a combination of a rectangular prism and a pyramid. To find the volume of the entire shape you find the volume of each individual shape and add them together. The second figure consists of a cylinder and a hemisphere. Check out the video below for the full lesson.

How To: Find the Volume of a Truncated Pyramid.

A truncated pyramid (frustum) is a pyramid with the top cut off. This video reviews how to find the volume.

How To: Classify a Triangle as an Isosceles Triangle.

Video: . What is an isosceles trapezoid. The video goes over the properties that are unique to an isosceles trapezoid.

How To: Simplify Square and Cube Roots

Whenever you simplify a square root or a cube root you are writing them in the simplest form. This video teaches a factoring method.

How To: Complete the Square of a Quadratic Function.

How to use "we half it,we square,we add it to both sides" when using the complete the square" This method can help make a complex Math problem a little bit easier.

How To: Add Fractions Without a LCM

This video has 7 fraction hacks that can save you time when working with fractions. The hacks are: Adding fractions without a LCM

How To: Find the Sector Area

The sector area is a section of the circle. You can think of it as finding the area of a pizza slice instead of the entire pizza.

How To: Simplify Complex Fractions

The key to simplifying fractions is to convert the fraction from a hamburger to a hot dog. In other words you change it from a fraction to a division problem, and then use Keep,Change,Flip to simplify. The video explains all of this and helps make complex fractions,simple.