# Basic mathematics blog

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### How to Divide any Number by 5 in 2 Seconds

How to divide any number by 5 in 2 seconds or less using a math trick

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### Math Trick to Square Numbers from 50 to 59

Use this math trick to square numbers from 50 to 59 in 2 seconds or less

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### Sum of Consecutive Odd Numbers

Find the sum of consecutive odd numbers in 4 seconds or less

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### Sum of Consecutive Even Numbers

Here is how to find the sum of consecutive even numbers in 4 seconds or less using a trick.

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### Divide any 3-Digit Number by 99 in 3 seconds

Use this trick to divide any 3-digit number by 99 in 3 seconds or less

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### 5 Percent of any Number in 4 Seconds

Use this trick to find 5 percent of any number in 4 seconds or less.

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### Square a 3-Digit Number when the Middle Number is Zero

How to square a 3-digit number when the middle number is zero in 4 seconds or less

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### Multiply a Two Digit Number by 101 in one Second

Use this trick to multiply a two-digit number by 101 in one second or less

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### How to Solve a System of two Linear Equations Quickly

How to solve a system of two linear equations quickly (in 15 seconds or less!)

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### How to Multiply 3-digit Numbers Having a Zero in the Tens Place

In 5 seconds or less, here is how to multiply 3-digit numbers having a zero in the tens place

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### Trick to Multiply a Repdigit Number by a Single Digit Number

Trick to multiply a repdigit number smaller than 100 by a single digit number in 2 seconds or less

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### Multiply 999 by 5 in 2 Seconds

How to multiply 999 by 5 in 2 seconds or less with this amazing trick

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### Divide 999 by 5 in 2 Seconds

How to divide 999 by 5 in 2 seconds or less with this amazing trick

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### Square Root Trick When the Number Ends with 25

A second to find it! Square root trick when the number ends with 25.

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### Types of Lines in Math

Find here a comprehensive list of all the different types of lines in math.

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### Percent of Increase Word Problems

A variety of percent of increase word problems along with detailed solutions

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### What is Algebra? Definition and Examples

Algebra is a fundamental skill that is widely used in school and in life. This article takes a look at what algebra is and its vital role in math.

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### How To Find The Factors Of 20: A Simple Way

There are many ways to find the factors of 20. A simple way is to...

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### The SAT Math Test: How To Be Prepared To Face It And Survive

The SAT Math section is known for being difficult. But it doesn’t have to be. Learn how to be prepared and complete the section with confidence here.

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### Fundamental Counting Principle

The fundamental counting principle is introduced in this lesson. Learn how to count with the multiplication principle and the addition principle.

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### 45-45-90 Triangle

What is a 45-45-90 triangle? Definition, proof, area, and easy to follow real-world examples.

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### Theoretical Probability - Definition, Explanation, and Examples

Learn how to compute the likelihood or probability of an event using the theoretical probability formula.

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### 30-60-90 Triangle

What is a 30-60-90 triangle? Definition, proof, area, and easy to follow real-world examples.

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### Calculate the Conditional Probability using a Contingency Table

Learn to calculate the conditional probability using a contingency table. This contingency table can help you understand quickly and painlessly.

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### Rational Numbers - Definition and Examples

To learn about rational numbers, write their decimal expansion, and recognize rational numbers that are repeating decimals and terminating decimals.

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### Area of a Trapezoid - Definition, Formula, and Examples

Learn how to get the area of a trapezoid using a rectangle and a triangle, the formula, and also when the height of the trapezoid is missing.

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### Quadratic Formula: Easy To Follow Steps

Learn about the quadratic formula, the discriminant, important definitions related to the formula, and applications.

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### Area Formula - List of Important Formulas

What is the area formula for a two-dimensional figure? Here is a list of the ones that you must know!

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### Parallelogram - Definition, Types, and Examples

What is a parallelogram? Here is the list of all the most important things that you need to know

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### High School Physics: The Free Resources to Learn and Study

Do you need help with high school physics? Explore important basic concepts in physics.

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### How To Learn Math (And Stay Good At It!)

Find out how to learn math and stay good at it using these five steps.

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### Why is Geometry Important? (And How Can You Benefit ?)

Why is geometry important? Geometry isn't just about drawing shapes. Its practical applications are endless. See how geometry can help enhance your life.

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### What is a Unit Circle? Definition and trigonometric values

Definition of the unit circle and important trigonometric functions. Use the unit circle to derive important trigonometric values.

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### Types of Triangles

Learn to identify 6 types of triangles based on their sides or angles and 7 more types based on both their sides and angles.

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### Box and Whiskers Plot

Easily learn to construct a box and whiskers plot for a set of data by using the median and the extreme values.

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### Binary Number System

This lesson will give you a deep and solid introduction to the binary number system.

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### Perimeter of a Square

Check out this lesson. You will discover that finding the perimeter of a square is simple and straightforward.

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### Law of Cosines - Formula, Proof, and Examples

What is the Law of Cosines? See how you can use the law of cosines to find one side of a triangle.

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### Conjugate of a Complex Number

What is the conjugate of complex number? Definition, explanation, and examples.

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### What are Bar graphs Good for? Definition and Examples

This lesson will help you clearly understand the different types of bar graphs such as the vertical bar graph, grouped bar graph, and stacked bar graph.

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### Solving Two-Step Equations

This lesson presents the steps to take when solving two-step equations or equations of the form ax + b = c or ax - b = c.

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### 6th Grade Math Problems

A variety of 6th grade math problems students need to know how to solve in 6th grade.

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### Second Grade Math Word Problems

A list of important second grade math word problems that students need to know how to solve in second grade

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### Surface Area of a Sphere - Definition, Derivation, and Examples

Learn how to derive and compute the surface area of a sphere. The lesson is crystal clear and right to the point, but it also shows how the formula was obtained

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### Surface Area of a Cylinder - Definition, Derivation, and Examples

Learn how to compute the surface area of a cylinder, oblique cylinder, and hollow cylinder. Learn also to derive the formula.

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100 Tough Algebra Word Problems.

If you can solve these problems with no help, you must be a genius!

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