In this video, we're going to focus on calculating percentages without the use of a calculator. We're going to do it mentally and then we'll confirm our answer with the use of a calculator. So here's the first question: what is 15% of 200? How can we find the answer to this question mentally? Well, first ask yourself, what is 10% of 200? To find 10% of a number, simply move the decimal one unit to the left. So 10 percent of 200 is 20. Now, if 10% of 200 is 20, what is 5% of 200? 5 percent is 1/2 of 10 percent. So, what is 1/2 of 20? Half of 20 is 10. So now, with this information, how can we find out the value of 15 percent of 200? Well, since 10 percent plus 5 percent adds up to 15 percent, 20 plus 10 must represent the value of 15 percent of 200, which is 30. Now, to confirm the answer using the calculator, we need to take 200 and multiply it by 15 percent as a decimal. To convert a percentage into a decimal, simply divide by 100. 15 divided by 100 is 0.15. You can also move the decimal point two units to the left. Now let's multiply 200 by 0.15. If you have a calculator, go ahead and type this in. So 200 times 0.15 is indeed equal to 30. So now you know how to do percentages mentally. So let's go ahead and work on some more examples. Now, what is 25% of 300? Go ahead and take a minute, pause the video, work on this example, and then unpause it to see if you have the right answer. So, let's start with 10% of 300. How much does that amount to? What...
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