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How to Find 40 Percent of a Number

# How to Find 40 Percent of a Number

To find the percentage of a number you want, change the percent into a decimal, and the word "of" into multiplication. For example, "40 percent of 4 is 1. 2". This means 40 percent of 4 is 40% of 4, which is 16.

### Math

Percentages are found in many contexts beyond practice problems in math textbooks. One of the best examples is sale prices, which are often advertised as a particular percentage off of a price. Tips on a restaurant bill are also usually calculated as a percentage of the total bill. Knowing how to calculate percentages is a useful skill; sometimes you'll need to know the exact percent of a number, while others only require an estimate. You can perform these calculations in your head or by using a calculator.

This is all nice, but we usually do not use percents just by themselves. Mostly, we want to answer how big is one number in relation to another number?. To try to visualize it, imagine that we have something everyone likes, for example, a large packet of cookies (or donuts or chocolates, whatever you prefer ðŸ˜‰ - we will stick to cookies). Let's try to find an answer to the question of what is 40% of 20? It is 40 hundredths of 20, so if we divided 20 cookies into 100 even parts (good luck with that!), 40 of those parts would be 40% of 20 cookies. Let's do the math: (Source: www.omnicalculator.com)

### Decimal

Percentages are sometimes better at expressing various quantities than decimal fractions in chemistry or physics. For example, it is much convenient to say that percentage concentration of a specific substance is 15.7% than that there are 18.66 grams of substance in 118.66 grams of solution (like in an example in percentage concentration calculator). Another example is efficiency (or its special case - Carnot efficiency). Is it better to say that a car engine works with an efficiency of 20% or that it produces an energy output of 0.2 kWh from the input energy of 1 kWh? What do you think? We are sure that you're already well aware that knowing how to get a percentage of a number is a valuable ability.

You find here several easy percentage calculators with examples. You can use our easy percent calculators to compute percentages. You can use comma or dot as a decimal separator. You don't have to use thousands separators because this calculator treats both comma and dot as a decimal separator. In order to calculate percentages online, click the button. The result appears on the next page. If there are errors, the result field will be empty. Try this handy online tool to check your problems on percentages. Find the percentage change between two numbers or calculate a percent of a value before and after. Our purpose is to offer the best online percentage calculator with fast and useful answers. Whenever you need to calculate percentages or find out how to calculate a percentage, this free website will help you. We hope that you enjoy the time you spend on the website. Please feel free to send us your comments or suggestions. Whether you want to work out an appropriate tip at a restaurant, find out what percentage discount you’re receiving on a product or determine what a specific percentage of a number is, the need to know how to find the percent of something comes up regularly. To calculate percent values, you need to understand what percentage really means. Converting between decimal proportions and percentages is simple, but it also makes it really easy to estimate simple percentages and perform more complicated calculations. (Source: sciencing.com)

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