Grace Imson, MA
Math Instructor, City College of San Francisco
wikiHow's Editorial Process wikiHow partners with over 1000+ experts from a wide range of fields to ensure our content is accurate and based on well-established research and testimony. Content Managers conduct interviews and work closely with each expert to review information, answer reader questions, and add credible advice. Learn more about our editorial process and why millions of readers trust wikiHow.
Co-authored Articles (237)
How to
Use an Abacus
The abacus (the suanpan is the most useful variety) is a deceptively simple calculating tool still used all over the world. It's a useful learning device for the visually impaired, as well as for anyone who wants to lear...
How to
Do Long Division
A part of basic arithmetic, long division is a method of solving and finding the answer and remainder for division problems that involve numbers with at least two digits. Learning the basic steps of long division will al...
How to
Calculate Standard Deviation
Standard deviation tells you how spread out the numbers are in a sample. Once you know what numbers and equations to use, calculating standard deviation is simple!
The Trachtenberg Method: Learn to Calculate Multi-Digit Numbers Quickly
Quick, easy techniques to add, multiply, and divide without breaking a sweat Do you wish you could do more math in your head? Do you find conventional arithmetic difficult? Then the Trachtenberg method is perfect for yo...
How to
Calculate the Circumference of a Circle
Need to know how to find the circumference of a circle? Can't remember the circumference formula? Don't sweat it—we've got you covered. If you know the diameter, simply plug it into this formula: '''C=πd'''. Were you...
How to
Convert from Decimal to Binary
The decimal (base ten) numeral system has ten possible values (0,1,2,3,4,5,6,7,8, or 9) for each place-value. In contrast, the binary (base two) numeral system has two possible values represented as 0 or 1 for each pla...
How to
Convert Radians to Degrees
Radians and degrees are both units used for measuring angles. As you may know, a circle is comprised of 2π radians, which is the equivalent of 360°; both of these values represent going "once around" a circle. Therefo...
How to
Calculate Ratios
Ratios are mathematical expressions that compare two or more numbers. They can compare absolute quantities and amounts ''or'' can be used to compare portions of a larger whole. Ratios can be calculated and written in sev...
How to Calculate the Slope of a Line
Learn to calculate the slope of a line with these simple methods If you’re taking algebra, finding the slope of a line is an important concept to understand. But there are multiple ways to find the slope, and your teac...
How to
Do Division
Division is one of the 4 major operations in arithmetic, alongside addition, subtraction, and multiplication. In addition to whole numbers, you can divide decimals, fractions, or exponents. You can do long division or, i...
How to Use the Percent Change Formula
Easily find percent increase or decrease with this simple equationLooking at the change in percent of a number, as opposed to the change in value, can give you a more useful representation of how something has increased...
How to
Do Long Multiplication
Long multiplication can seem very intimidating, especially if you're multiplying two numbers that are pretty large. If you take it step by step, though, you'll be able to do long multiplication in no time. Get ready to a...
How to Find Horizontal Asymptotes: Rules for Rational Functions
If you see a dashed or dotted horizontal line on a graph, it refers to a horizontal asymptote (HA). In a rational function, an equation with a ratio of 2 polynomials, an asymptote is a line that curves closely toward the...
How to
Find the Y Intercept
On their own, y-intercepts aren’t complicated at all—they’re simply points where the graph of the equation intersects with the Y-axis. But how are you supposed to find a y-intercept when you only have a limited amo...
How to
Calculate Percentage Increase
Knowing how to calculate percentage increase is useful in a variety of situations. For instance, even when watching the news, you'll often hear a change described in large numbers without any percentage to give them cont...
How to Calibrate a Digital Scale With and Without Weights
Simple steps to get your scale to measure accurately Over time, your digital pocket scale can get uncalibrated, whether it’s from regular use, wear and tear, or moving it to a new location. If your scale is giving you ...
How to
Find the Domain of a Function
The domain of a function is the set of numbers that can go into a given function. In other words, it is the set of x-values that you can put into any given equation. The set of possible y-values is called the range. If y...
How to
Calculate Volume in Litres
A liter (or litre) is a metric unit used to measure volume or capacity. Liters are a common measurement often used to measure beverages and other liquids, such as a 2 liter bottle of soda. Sometimes you will need to calc...
How Big Is an Inch? Here's How to Measure Accurately
Learn to measure in inches using rulers, everyday items, or by converting from metric units Measuring objects in inches might seem straightforward. But what if you’re not accustomed to using a ruler or don’t have one...
How to
Calculate the Volume of a Cylinder
center A cylinder is a simple geometric shape with two equally-sized and parallel circular bases. Calculating the volume of a cylinder is simple once you know the formula.https://www.mathsisfun.com/definitions/cylinder.h...
