An exchange rate of 1 EUR = 9 MXN means that one euro can be exchanged for nine Mexican pesos. In practical terms:
For example, a souvenir priced at 450 pesos would cost €50 (450 ÷ 9). A €100 hotel room would cost 900 pesos.
Exchange rates fluctuate daily based on interest rates, inflation, trade balances, and market sentiment. Always check a live converter (like XE, OANDA, or your bank) before exchanging money.