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+ FollowGrace Imson, MA
Math Instructor, City College of San Francisco
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Co-authored Articles (244)
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
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 24 Hour to 12 Hour Time
If you’ve ever been stumped when you see a clock read something like 14:24, it's probably because you’re unfamiliar with 24-hour time. This form of timekeeping is commonly used in the U.S. military, Europe, and other...
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
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...
The Trachtenberg Method: Learn to Calculate Multi-Digit Numbers Quickly
Quick, easy techniques to add, multiply, and divide without breaking a sweatDo 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 Volume of a Cylinder
centerA 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...
How to
Calculate the Area of a Circle
Need to know how to find the area of a circle? This is a common geometry problem and figuring out the answer is pretty easy. In most cases, you can use the simple formula A=\pi r^2. If you don't know the radius, don't w...
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!
How to
Calculate the Area of a Trapezoid
A trapezoid, also known as a trapezium, is a 4-sided shape with two parallel bases that are different lengths. The formula for the area of a trapezoid is A = ½(b1+b2)h, where b1 and b2 are the lengths of the bases and h...
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
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 Milliliters (mL) to Grams (g)
centerConverting from milliliters (mL) to grams (g) is more complicated than plugging in a number, because it converts a volume unit, milliliters, to a mass unit, grams. This means each substance will have a different f...
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
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 Radius of a Circle
The radius of a circle is the distance from the center of the circle to any point on its circumference. The easiest way to find the radius is by dividing the diameter in half. If you don’t know the diameter but you kno...
Converting Minutes to Hours in Decimal or Hour & Minute Format
Quick and easy calculations for whichever hour format you needNot sure how to change a measure of time in minutes to one in hours? Not to worry! It's easy to make this conversion in just a few simple steps. We’ll show ...
How to
Calculate Cumulative Frequency
Calculating cumulative frequency gives you the sum (or running total) of all the frequencies up to a certain point in a data set. This measure is different from absolute frequency, which refers to the number of times a p...
How to
Find the Surface Area of a Rectangular Prism
A rectangular prism is a name for a 6-sided 3-dimensional figure that is very familiar to everybody—a box. Think of a brick, or a shoebox, and you know exactly what a rectangular prism is. The surface area is the amoun...
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 unitsMeasuring objects in inches might seem straightforward. But what if you’re not accustomed to using a ruler or don’t have one...