Kevin Wang
Math Tutor
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Co-authored Articles (20)
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...
Mastering Mind-bending Math Tricks (An In-depth Guide for Beginners)
Wow your audience with the power of mathGrab your cape and top hat, because you're about to create magic. Math magic! All of those math tricks you've seen performed by friends, teachers, and YouTubers...they're actually ...
How to
Play Pool Like a Mathematician
Billiard balls collide with nearly perfect elasticity. This means that the kinetic energy in their motion is almost completely preserved, and very little of it dissipates into heat or other energy sinks. This makes pool ...
How to
Do a Number Trick to Guess Someone's Age
There are lots of number tricks you can do by using math. You can give someone a particular set of instructions and calculations and their current age can be deduced with a bit of mental math.. 27 August 2024. To them it...
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
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
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
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
Pass the Postal Exam
If you're looking to join the United States Postal Service, you'll need to pass the Postal Exam first. If you've never taken it before, you may be surprised to learn how difficult the exam can be; most people don't pass ...
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 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 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
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
Create a Times Table to Memorize in Excel
In this article, you'll learn to create a Times Table or Multiplication Table in Microsoft Excel, which can be adapted to being a Division Table and saved separately. This table can help you to study multiplication and d...
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
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
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
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...
