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Course: Grade 5 (TX TEKS) > Unit 1
Lesson 5: Estimate multi-digit division- Strategies for dividing multiples of 10, 100, and 1000
- Divide by taking out factors of 10
- Estimating multi-digit division
- Estimate multi-digit division problems
- Estimating multi-digit division word problems
- Multi-digit division estimation word problems
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Estimating multi-digit division word problems
Practice using estimation as a strategy to solve multi-digit division word problems. Created by Sal Khan.
Video transcript
- [Instructor] 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. And to figure out this,
I'm just going to round some of these numbers so
that I can work with them in my head. And so 40 is already a nice,
clean, friendly number. And let's see, I'm gonna have
to divide this number by 40, or 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. And if I round this to the nearest 100, that gets me to 4,800. So I could say this is going
to be approximately equal to 4,800 divided by 40. Why did I like 4,800? Well, because four 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 4800, 1200 times. So 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 not 6,000, 600 if I round to the nearest 100. And 630 are nice, friendly numbers. 30 goes into 600 pretty cleanly. 60 divided by 30 is 2 so 600
divided by 30 would be 20. So approximately 20 tickets per student.