Kevin Wang
Math Tutor
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Co-authored Articles (19)
4 Mind-Blowing Calculator Tricks
Impress friends and family with the power of mathWho said that magic tricks had to be all smoke and mirrors? With the help of your handy calculator, you can amaze your friends and classmates with all sorts of clever tric...
How to
Calculate Frequency
Frequency, also called wave frequency, is a measurement of the total number of vibrations or oscillations made within a certain amount of time. There are a few different ways to calculate frequency based on the informati...
How to
Do a Cool Mathematical Mind Reading Trick
Mathematical mind reading tricks are a great way to combine your mastery of math with a bit of magical fun.
How to
Calculate RPM
Revolutions per minute, or RPM, are a measure of how fast a rotating object turns. Knowing how fast an object turns is important in determining wind speed, gear ratios, how powerful a motor is, and how well bullets fly a...
How to
Construct a Golden Rectangle
A golden rectangle is a rectangle with side lengths that are in the golden ratio (about 1:1.618).. 27 August 2024. This article also explains how to construct a square, which is needed to construct a golden rectangle.
How to
Calculate the Cross Product of Two Vectors
The cross product is a type of vector multiplication only defined in three and seven dimensions that outputs another vector. This operation, used in almost exclusively three dimensions, is useful for applications in phys...
How to
Calculate Days of the Week Like Rainman
We can all calculate the day of any week mentally just like the character played by Dustin Hoffman in the movie “Rainman”. It's not as difficult as you might think.
How to
Calculate the Games Back Number for a Sports Teams Standings
Ever been looking into the sports paper, and notice your team is in second place or first place, and wonder how do they determine what place your team is in? This article will tell you how the newspapers and sports anal...
How to
Figure Cost Per Square Inch of Pizza
When deciding where to order a pizza, you likely want to consider value. One way to consider the value of a pizza is to determine how much the pizza costs per square inch. In order to find this cost, you need to determin...
How to
Find the Midpoint of a Line Segment
Finding the midpoint of a line segment is easy as long as you know the coordinates of the two endpoints. The most common way to do this is to use the midpoint formula, but there's another way to find the midpoint of a li...
How to
Find Eigenvalues and Eigenvectors
The matrix equation A\mathbf{x} = \mathbf{b} involves a matrix acting on a vector to produce another vector. In general, the way A acts on \mathbf{x} is complicated, but there are certain cases where the action maps to ...
How to
Construct a Perpendicular Line to a Given Line Through Point on the Line
Perpendicular lines are lines that form right angles. These types of lines are used often in geometry, so it is important to know how to construct them. The simplest way to construct a perpendicular line is to use a prot...
How to
Construct Regular Polygons Using a Circle
Constructing regular polygons accurately is very significant in geometry and is easy to do. If you have ever wondered about how to construct regular polygons from a circle, you’re reading the right article.
How to
Estimate Height
Estimating height can be difficult. You may want to estimate how tall your baby will be or someone’s height who’s standing near you. You may also want to estimate the height of tall objects, like trees or buildings. ...
How to
Do Vedic Math Shortcut Multiplication
Vedic Math can be used to multiply large numbers in a matter of seconds without using a calculator! Here are some quick examples of how you can use this technique.
How to
Calculate Contour Integrals
Contour integration is integration along a path in the complex plane. The process of contour integration is very similar to calculating line integrals in multivariable calculus. As with the real integrals, contour integr...
How to
Plot Polar Coordinates
The familiar rectangular grid is an easy system to learn, but it is not convenient in all situations. What if you want to plot the spokes on a wheel, or the movement of water down a drain? In these cases, a circular coor...
How to
Perform an LU Factorization
To solve systems of three or more linear equations, you'll typically convert the problem into an augmented matrix and row reduce from there. However, this process can be slow and inefficient with more equations. The numb...
How to
Translate a Shape
In your middle school or high school geometry class, you will likely learn how to , translate, , and dilate shapes on a coordinate plane. Translating a shape means moving it around. Every point must move by the same dist...
