ʕ•ᴥ•ʔ Dividing Rational Numbers with Fractions with an Easy Trick

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Quickly master how to divide rational numbers with fractions with an easy trick. Watch more lessons like this and try our practice at

Similar to the previous section, we will practice adding, subtracting, multiplying, and dividing rational numbers. Rational numbers can be expressed in two forms: fraction form and decimal form. This time, we will deal with rational numbers in fraction form.

Hi, welcome to this question right here. So what we have here is the division now. So okay, there's s trick to that. So first of all before we do anything. It's still the original method. We should change to improper fractions. Okay? Excuse me. So what we have here is this. We go ourselves-- Let me just rewrite the question here, down here with the division sign and here's the negative two and the one third, right? So let's change everything to improper fractions, okay? So it looks nicer.

So three times one, and so remember through the room. Let me show you a little bit of work. So the work is simple. Let me choose a color pen right here. So three times the one, and plus the one on the top. So okay. This is multiplication, this is addition. Three times one is three, plus one is four. So this is actually negative four over three. Right there. Divided by the same thing right here. So three times two, and you add a one to that. So three times two is six, plus one is seven. Negative seven over three. Okay?

When you're doing the multiplying and adding this part right here, don't worry about the negative sign. Just bring it down, all right? So we have a negative four over three, divided by negative seven over three, okay? There's two things that we needed to clear before we do anything. First of all, negative and the negative number, if you're dividing or multiplying it doesn't matter which one you're going to do, it becomes positive okay? So you don't have to worry about the negative sign anymore. So if you want, I can actually rewrite it, everything is the same except that the negative signs are gone. Okay, because negative, negative becomes positive whenever you do multiplying or dividing.

Then you still have the negative-- the division sign, right? Here's a little trick for us. So four over three divided by seven over three. What happens is, if I just going to bring the work up here, and let's change the color pen so it looks better. Four over three, keep the first part the same, but we can actually change it into multiplying. How do we do that? Simply flip the seven with the three. Okay?
Flip these two. So we got three over seven, okay? Makes sense so far. So guess what happen, what we have. Well, a little bit of simplifying before we go to the next step. Three and three are cancelled, becomes one and one. So you're just down to four over seven, and four over seven is your final answer, okay? So be careful in the last step right there. Flip it over, do the little simplification and you should answer no problem at all.

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