9 = 1/6 of the total price.
6 sixths = 1.
Therefore, if we multiply that amount by 6, we'll have the full price.
9 × 6 = $54
This is a great example of inverse operations, by the way. Division and multiplication of the same value will cancel out just like addition and subtraction.
To express this in a comparison chart, just draw a block and label it 9 dollars.
Then draw 5 more blocks (for a total of 6) and label them as 54 blocks altogether.
I have an example attached.