Step by step
The question
Question: change 250 centimeters into meters.
1 Find the link
1 meter is 100 centimeters.
2 Make the unit fraction
We want meters, so meters go on top.
We have centimeters, so centimeters go at the bottom.
Top and bottom are the same amount.
So the fraction is 1, and times 1 keeps the size.
Careful!
Not upside down.
Then the centimeters would not cross out.
3 Multiply
We multiply 250 centimeters by the fraction.
Centimeters on top and at the bottom cancel, like numbers.
Cross them out.
Meters are left.
What is left: 250, divided by 100.
250 divided by 100 is 2.5.
So 250 centimeters is 2.5 meters.
4 Check
Does it make sense?
Meters are bigger than centimeters.
So we need fewer of them.
2.5 is less than 250.
Yes.
And back the other way: 2.5 times 100 = 250.
We get 250 centimeters again.
So the answer is right!
Let's look back.
First: find the link.
Then: make the unit fraction.
Then: multiply.
Last: check.