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How do I add and Subtract Percentages on my Calculator?
A. There is a certain way of adding and subtracting percentages to take account of the Mark up function. Casio logic dictates certain conventions when using the % button for example:
4+17.5% calculates the sale price to make a 17.5% profit margin.
4 x 17.5%+ adds 17.5% to 4.
If you need to work out just the percentage omit the + from the end of the equation and if you need to subtract the percentage substitute the + for -.
[Start value] + [percentage value] %
gives the selling price to make a margin of the required percentage e.g. 100 + 20% gives a selling price of £125 because £25 is 20% of £125.
[End value] – [Start value] %
gives the percentage increase from the start value to the end value
These features are useful for accountancy purposes and are present on most Casio desktop calculators.
How to Use the Percentage Key on a Calculator
Although people often ignore it because they do not fully understand it, the percent key on a calculator can be an invaluable tool. When you wish to figure out what a specific percentage is of another number or a number equation, you can simplify this process by using the percent key on your calculator. Once you understand how it works and see how you can use this key, you may use it often.
Determine what a specific percentage is of another number. For example, enter 600 x 15 and hit the percent key. You see the answer is 90, which means that 90 is 15 percent of 600.
Calculate a percentage
Calculate a percentage of a number and add it to the number. For example, enter 34 + 7 and hit the percent key. You immediately see the answer is 36.38. This is useful for figuring sales tax on purchase items.
Figure a percentage of a number and subtract it from the number. For example, enter 79 – 30 and hit the percent key. You see the answer is 55.3. This is useful for figuring sale prices on purchase items.
- If your calculator has a “%” button. Let’s say you wanted to find 19 percent of 20. Press these buttons: 1 9 % * 2 0 = …
- If your calculator does not have a “%” button. Step 1: Remove the percent sign and add a couple of zeros after the decimal point. 19% becomes 19.00.
How to Do Percentages on a Calculator
A percentage is a special way of representing a portion of something. A percentage is a number that indicates a fraction made up of 100 parts. Thus, 100% means the whole thing (whatever is being measured), while 50% means one half. If you learn how to write numbers as percentages, it then becomes easy to perform multiplication and other calculations with percentages on a calculator. Some calculators even have a % button that makes the calculation even easier.
Review the general meaning of fractions. A fraction is a comparison between two numbers, usually representing the size of a part of something to the size of the whole thing. The classic example is a pie that is cut into eight, for example, equal portions. The top of the fraction, called the
The bottom of the fraction, called the
– in this case, 8.
- For example, the fraction 1/8 represents one piece of the pie that has been cut in eight pieces.
- The fraction 7/8 represents 7 pieces, almost the full pie.
Recognize the special relationship of percentages. A percentage is a special kind of fraction in which the
 While this is not practical when cutting slices of an actual pie, the concept of percentages is much more useful because it is standard.
- With fractions, the size of “half” of something will depend on the number of pieces. If your “pie” is cut into 8 pieces, then half would be 4. But if your “pie” is in 22 pieces, then half would be 11. The target always changes. But with percentages, one-half is always the same – 50%.
- It’s helpful to remember that the word “percent” actually means “of 100″—”per” means “of,” and “cent” means “100.”
Use a calculator to convert any fraction to a decimal or percentage. If you are presented with any fraction, you can very easily convert it to a decimal number using any calculator. Just recognize that a fraction represents a division problem, and
Your calculator will give you the decimal equivalent of the fraction.
- Suppose you have the fraction 1/2. On your calculator, perform the operation 1 ÷ 2, and the calculator will show the result 0.5.
- Convert the fraction 1/4 into a decimal by performing the operation 1 ÷ 4. The result is 0.25.
- For a more complicated example, you can convert the fraction 274/312 into a decimal with the operation 274 ÷ 312. The result will be
Casio Computer Co., Ltd. (カシオ計算機株式会社, Kashio Keisanki Kabushiki-gaisha) is a Japanese multinational electronics manufacturing company headquartered in Shibuya, Tokyo, Japan. Its products include calculators, mobile phones, digital cameras, electronic musical instruments, and analogue and digital watches. It was founded in 1946, and in 1957 introduced the world’s first entirely electric compact calculator. It was an early digital camera innovator, and during the 1980s and 1990s, the company developed numerous affordable home electronic keyboards for musicians along with introducing the world’s first mass-produced digital watches.
Kashio’s first major product was the yubiwa pipe, a finger ring that would hold a cigarette, allowing the wearer to smoke the cigarette down to its nub while also leaving the wearer’s hands-free. Japan was impoverished immediately following World War II, so cigarettes were valuable, and the invention was a success.
After seeing the electric calculators at the first Business Show in Ginza, Tokyo in 1949, Kashio and his younger brothers (Toshio, Kazuo, and Yukio) used their profits from the yubiwa pipe to develop their calculators. Most of the calculators at that time worked using gears and could be operated by hand using a crank or using a motor (see adding machine).
Toshio possessed some knowledge of electronics and set out to make a calculator using solenoids. After dozens of prototypes were tested, the desk-sized calculator was finished in 1954 and was Japan’s first electro-mechanical calculator. One of the central and more important innovations of the calculator was its adoption of the 10-key number pad; at that time other calculators were using a “full keypad”, which meant that each place in the number (1s, 10s, 100s, etc …) had nine keys. Another distinguishing innovation was the use of a single display window instead of the three display windows (one for each argument and one for the answer) used in other calculators.
In July 2019, the company’s UK arm, Casio Electronics Co. Ltd, was fined £3.7 million after admitting resale price maintenance (a form of price-fixing) between 2013 and 2018, in breach of the United Kingdom’s Competition Act 1998.
Casio also makes products for local markets, including “Prayer Compass” watch series designed to help Muslims pray on time and in the right direction.