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

Finding percentages with a double number line

2m read
·Nov 10, 2024

We're told that Omar's class has 28 students in it. 21 of them take the bus to school. What percentage of the students in Omar's class take the bus to school? Pause this video and see if you can figure that out.

All right, well, I'm going to try to visualize this with what we call a dub and a double number line. So let's say that is 0, and 28 is the total number of students in this classroom right over here. It's a double number line because I'm going to make another number line right below it, but I'm going to write these points in terms of percentages. So 0 students would be 0 of the students in Omar's class, and 28 students would be 100 of the students in Omar's class.

And so what we really need to do now is we know that 21 of them take the bus. 21 is going to be roughly around here, so that's 21. So we really just need to figure out: what percentage is this going to be? One way to think about it is: what fraction is 21 of 28? Well, if I write 21 over 28, we know that we can divide both the numerator and the denominator by 7. They're both divisible by 7. 21 divided by 7 is 3, and 28 divided by 7 is 4. So 21 is 3/4 of 28.

So let's divide this number line from 0 to 28 into fourths. So that would be halfway, and now we have it divided into fourths. We can see that 21 is one, two, three of these fourths. Well, if 21 is three-fourths of the way to 28, then whatever percentage this is here, that would be three-fourths of the way to a hundred.

So let's divide this into fourths as well. Now we know that one-fourth of a hundred is twenty-five percent, two-fourths of a hundred is fifty percent, and three-fourths of a hundred is seventy-five percent. So what percentage of the students in Omar's class take the bus to school? 75 percent.

Ratios and double number lines
Making an Undercover Drug Bust | Locked Up Abroad: Declassified

More Articles

View All
Helping Landlords Find Tenants – Sean Mitchell of Rezi
Why don’t we start with just a brief explanation of what Resi does and then go back to what you apply to? I see with so. Resi is where a rental marketplace with the mission to make renting better. We use our technology and we use finance in order to prov…
Adventurers Jim & Tori Baird on their son’s FOXG1 diagnosis, life in the wild | National Geographic
Wesley, as challenging as some of our days might be with him, I wouldn’t want to change him for the world because he is just the happiest little thing. My name is Jim Baird and I am Tori Baird. We have two boys, Wesley and Hudson. Wesley is just a little…
How To Make Graphene
Picture this: you are thrown into a dingy room and told, “You can’t leave until you have created the thinnest material known to man.” Not only that, it must also be the strongest, the best thermal conductor, and as good at conducting electricity as copper…
The Stanford Prison Experiment
One of the most infamous psychological studies ever conducted was the Stanford Prison Experiment. It’s mentioned in almost every intro to psychology textbook. They tend to focus on how unethical it was and are less critical of its supposed conclusion. Aug…
When Life Hurts, Stop Clinging to It | The Philosophy of Epictetus
Our very sense of wellbeing is at gunpoint when we cling to the fickle, unreliable outside world. Around two thousand years ago, Stoic philosopher Epictetus observed that people are burdened and dragged down because they tend to care about too many things…
Grammatical person and pronouns | The parts of speech | Grammar | Khan Academy
Serious question, Grimian: What’s the difference between me and you? Uh, well, in order to get… I mean, I don’t mean that, you know, in a snarky way. I mean that in like a conceptual way. What’s the difference? Uh, in terms of these two pronouns, what’s s…