 So we're going to go through some tips and tricks of using fractions per cents and decimals. That will be important when you're doing calculations in this course and in the lab. So the first one is converting fractions to decimals. So if you're given a fraction 47 out of 60 and you want to be able to use it more easily, it's good to convert to a decimal. So to convert fractions to decimals you just 47 divided by 60, 0.783. So if you're given any fraction you just divide the number in the numerator by the number in the denominator and you'll get your decimal. The second is converting a decimal to a percent. So we can just use that decimal we got in the last exercise. If you have a decimal and you want to convert it to a percent, you just move your decimal point two spaces, 78.3%. If we want to convert a percent to a decimal, so say you have 83%. You're going to get rid of your percent sign and move your decimal point to the left. So 0.83. If you want to convert a percent to a fraction it's pretty simple. If you have 41%, percent means per cent which is cent is 100. So it's 41 out of 100, so that's your percent into a fraction. Fraction to a percent. This is a little more complex and we have more than one way you can do it. You can do method A which is going to be starting with your fraction, let's say we have 16 out of 33. You can change that into a decimal and so we'll bring up our calculator. We have had 16 divided by 33 is equal to 0.485. And then change that decimal into a percent. We said we just move the decimal point and then you have 48.5%. So that's method A. It's going through decimal form to get to a fraction to a percent. The other way is if you would like to do a little more calculation. You can do 16 divided by 33 equals how many out of 100? Because remember we said percent was per 100. So then you can cross multiply 33x equals 1600. And then divide to solve for x. Here we have 1600 divided by 33 is going to give you 48.5. So x equals 48.5. So then you have 48.5 over 100 which is your percent. So you can get the same answer but you have to be able to go through that same way. So the last way that you might want to work with fractions, decimals and percents is to find the percent of a number. And so again there's going to be two different ways you can find the percent of a number. But say we're looking for 93% of 37. So what you can do is method A convert your percent to a decimal. So you're going to have 93% is going to be 0.93. And then multiply that by your number. So if you have 0.93 times 37 that will give you 34.4. So let's do another method and see if it gives us that same answer. And again we're going to cross multiply. So if you have 93 out of 100 remember that's what that percent sign means if you have out of 100 and you want to know how much of 37 that is 93 times 37 equals 100x a little bit. So then you'll use your calculator again. 93 times 37 is 34.41 equals 100x. If you divide by 100x equals 34.4. So you do get the same answer and that's how you can find the percent of a number.