welcome back to Math with Marilyn
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Today's topic deals with equivalent ratios
Given a table that contains x and y values
remember that equivalent means that they have the same value
this particular example, we have to find the missing value from the given table
Do-Do method
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Math with Marilyn
ratios can be written in three different forms
fractions
with a colon o
with the word - to
Do Do method
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Math with Marilyn
we're given an x value-input and a Y value- output
If the number increeases you are adding or multiplying
so in order to go from two to six
we have to multiply by three because we know that two times three is six
to go from 7 to 21
we're multiplying by three
and to go from nine to 27
We're also all multiplying by three
what you do to one ratio you have to do to the other
which is why they call it the Do-Do Method
we need to take five and multiply it by three
three times five obviously is 15
Let's recap
Remembering that equivalent means that they have to have the same value
Your ratios can be written in three different ways
We use what's called the Do-Do Method.
So what you do to one ratio
You do to the other
that helped us find the missing Y value by multiplying 5 times the 3 to get 15
The Do-Do Method.
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Math with Marilyn
