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### Course: 4th grade foundations (Eureka Math/EngageNY) >Unit 3

Lesson 4: Topic E: Foundations

# Division word problem: school building

Sal uses a picture and understanding of multiplication to solve a division word problem.   Created by Sal Khan.

## Want to join the conversation?

• Can you divide anything by zero?
• No, we do not divide by zero.
Consider: suppose there were 9 cookies and you want to share them equally among 3 people, you divide them up so that each person get 3 cookies - right?
Now, suppose you want to divide the 9 cookies among zero people.
Can you see that dividing 9 cookies among zero people does not make sense?
How can it be done?
That is why dividing by 0 is not allowed - it makes no sense.
Mathematicians say that dividing by zero is "undefined".

These videos might interest you - though the math is more difficult than what you are doing right now:
• How meany numbers are there in the world??
• Numbers have no end as you can always add another number after one number. If you think 10000000 is it, it could also be 100000000
• How many windows do they have?

Okay, so on three of the sides, the windows are seven by five, and seven times five is thirty-five.
Because there are three sides, you want to multiply 35 by three, and that is 105!

Now, the front is missing a window.

So 35 - 1 is 34.

105 plus 34 is 139.

So, this new KA building should have 139 windows. But, if there are windows on the doors, there are either 140 or 141, depending on if they have 1 or 2 doors.
• To is Friday jan 19 2024 my name is bob
• From the problem statement, is it certain all the floors are the same height?
• It is assumed they will be for the purposes of teaching averages, but in practice a building's floors can have different heights. Don't let that stop you from asking questions though!
(1 vote)
• what is an other strategy instead of skip counting
(1 vote)
• Why did he cross out "314 Math avenue" and "200 windows" ? I don't understand why?