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

Estimating multi-digit division word problems | Grade 5 (TX TEKS) | Khan Academy

2m read
·Nov 10, 2024

We're told a dog food company produced 4,813 dog biscuits. The company will put the dog biscuits into bags, each containing 40 biscuits. About how many bags will the company be able to fill? So pause the video and think about it, and remember you don't have to figure out exactly how many bags the company will be able to fill; they say about how many bags.

All right, now let's work through this together. To figure out this, I'm just going to round some of these numbers so that I can work with them in my head. So, 40 is already a nice, clean, friendly number. Let's see, I'm going to have to divide this number by 40. If I divided 4,813 by 40, I would get the exact number of bags that the company would be able to fill. But maybe I could round this to something that is very easy to divide by 40.

If I round this to the nearest 100, that gets me to 4,800. So I can say this is going to be approximately equal to 4,800 divided by 40. Why did I like 4,800? Well, because 4 goes into 48 really cleanly. So let's see, how many times does 4 go into 4,800?

4 goes into 48 12 times, so it goes into 4,800 1200 times. Therefore, 40 would go in 120 times. So I would say approximately 120 bags.

Let's do another example. A teacher is taking 29 students on a field trip to the state fair. The teacher has 592 tickets for the rides and games. She wants to divide up the tickets equally among the students. Estimate the number of tickets each student will get.

So again, pause the video and try to do that. All right, so neither of these numbers are really that friendly. But it looks like we can round them to numbers that are a little bit more friendly. So, 29 is approximately 30, and then 592 is approximately 600.

If I round to the nearest 100, 600 are nice, friendly numbers. 30 goes into 600 pretty cleanly; 600 divided by 30 would be 20. So, approximately 20 tickets per student.

The Housing Crisis that's Collapsing an Economy
"He Saved My Life" American Soldier Returns to Help Iraqi Captain Fleeing ISIS | National Geographic

More Articles

View All
Ethology and animal behavior
In this video, we will begin to explore the field of ethology, which is the study of animal behavior. Animal behavior and the word itself, ethology, it has its roots in the Greek ethos. You also might be familiar with the word ethics. Ethos and ethics, yo…
Defending Marine Wildlife | Explorer
NARRATOR: It’s the Sam Simon and its crew that are confronting the issues here head on. Of course, their day was a bit frustrating when you see this overwhelming amount of nets that’s out there, that there’s still the fishermen going out and laying more n…
THE END OF CREDIT SCORES | Major Changes Explained
What’s up, Graham? It’s guys here. So, as I’m sure most of you are aware, one of the most important aspects of personal finance, building wealth, and saving a ton of money is your credit score. Those three numbers can very much dictate whether or not you …
Describing rotation in 3d with a vector
How do you describe rotation in three dimensions? So, for example, I have here a globe, and it’s rotating in some way. There’s a certain direction that it’s rotating, a speed with which it’s rotating, and the question is how could you give me some numeric…
Worked examples: Definite integral properties 1 | AP Calculus AB | Khan Academy
We want to evaluate the definite integral from 3 to 3 of f of x dx. We’re given the graph of f of x and of y equals f of x, and the area between f of x and the x-axis over different intervals. Well, when you look at this, you actually don’t even have to …
How Much Is A Bird in The Hand Worth?
Hey, Vsauce. Michael here. And as they say, “a bird in the hand is worth two in the bush.” What it means is that it’s better to have a certain advantage than to have nothing, except the possibility of a greater one. But two birds in the bush? Who calcula…