Clearly explaining the concept of "normalizing" price and relative prices to undergraduate I am trying to clearly explain to the concept of "normalization" or relative prices. Because students are so used to just think of prices in absolute terms, it is initially tough to make the leap to the "relative" or "normalization" concept.

What is your angle if you were to explain this to an econ 101 student?

For example, the toughest part is to explain the "need" for looking at the ratio of prices. Who cares? Why is it useful?

Thanks bunch.
I usually ask if they would rather get an IPhone or 5000 South African Rands (ZAR). You can also ask if 5000 ZAR is a good enough monthly salary. As we are far from that country usually no one has a clue about the currency exchange rate.  This way you can explain that the number in itself is meaningless, what matters is what you can exchange it for, i.e. relative prices matter.