yego.me
💡 Stop wasting time. Read Youtube instead of watch. Download Chrome Extension

Multiplication and division relationship for fractions


2m read
·Nov 10, 2024

You are likely already familiar with the relationship between multiplication and division. For example, we know that three times six is equal to eighteen.

But another way to express that same relationship is to say, "All right, if 3 times 6 is 18, then if I were to start with 18 and divide it by 3, that would be equal to 6." Or you could say something like this: "That 18 divided by 6 is equal to 3."

Now, we're just going to extend this same relationship between multiplication and division to expressions that deal with fractions. So, for example, if I were to tell you that 1/4 divided by—I'm going to color code it—divided by 2 is equal to 1/8, is equal to 1/8. How could we express this relationship but using multiplication?

Well, if 1/4 divided by 2 is equal to 1/8, that means that 1/8 times 2 is equal to 1/4. Let me write this down. Or I could write it like this: I could write that 1/4 is going to be equal to—it's going to be equal to 1/8 times 2 times 2.

And we could do another example. Let's say that I were to walk up to you on the street and I were to tell you that, "Hey, 42 is equal to 7 divided by 1/6." In the future, we will learn to compute things like this, but just based on what you see here, how could we express this same relationship between 42, 7, and 1/6 but express it with multiplication?

Pause this video and think about that. If 42 is equal to 7 divided by 1/6, that means that 42 times 1/6 is equal to 7. So, let me write that down. This is the same relationship as saying that 42 times 1/6 is equal to 7.

Now, let's say I walk up to you on the street and I were to say, "All right, I'm telling you that one-fourth divided by six is equal to some number that we will express as t." So can we rewrite this relationship between 1/4, 6, and t, but instead of using division, use multiplication?

Pause this video and try to think about it. So, if 1/4 divided by 6 is equal to t, based on all of the examples we've just seen, that means that if we were to take t times 6, we would get 1/4. So we could write it this way: t times 6 is going to be equal to 1/4.

If this isn't making sense, I really want you to think about how this relationship is really just the same relationship we saw up here. The only new thing here is instead of always having whole numbers, we're having fractions and representing some of the numbers with letters.

More Articles

View All
Graphing two variable inequality
So what I would like to do in this video is graph the inequality negative 14x minus 7y is less than 4. And like always, I encourage you to pause this video and see if you can graph it on your own before we work through it together. So the way that I like…
Lensa makes $1M/Day (& Steals Your Face)
By this point, there’s no doubt about it: artificial intelligence is taking over the mainstream, and people who know how to leverage this technology are getting insanely rich. Applications like Lensa AI and Don AI are literally flipping mobile apps like I…
Paul Buchheit: What are some things successful founders have in common?
So this was actually where the focused frugality obsession and love thing came from. I was actually trying to distill it down into a small enough number of words, and then I was going to try to translate it into emoji, but I failed at that part. I couldn’…
Knowledge Makes the Existence of Resources Infinite
Knowledge is the thing that makes the existence of resources infinite. The creation of knowledge is unbounded. We’re just going to keep on creating more knowledge and thereby learning about more and different resources. There’s this wonderful parable of …
Proof: perpendicular radius bisects chord
So we have this circle called circle O based on the point at its center, and we have the segment OD, and we’re told that segment OD is a radius of circle O. Fair enough! We’re also told that segment OD is perpendicular to this chord, to chord AC, or to se…
Matt Ridley: How Innovation Works, Part 1
I don’t have heroes; a hero’s a big word. There are people that I look up to, and I’ve learned a lot from, and Matt Ridley has got to be near the top of that list. Growing up, I was a voracious reader, especially reading science. Matt had a bigger influen…