Percentages are a way to express a part of something in relation to the whole thing, using the symbol "%". It's like a way of dividing something into 100 equal parts.

For example, if you have 100 candies and you give away 25 of them, you can say that you gave away 25% of the candies. This means you gave away 25 out of 100 candies.

Another example is if you get a test back and you got 80% correct. This means you got 80 out of 100 questions correct.

To calculate percentages, you can use a formula:

percentage = (part / whole) x 100

This means you divide the part you want to express as a percentage by the whole, then multiply by 100 to get the percentage.

You can also use percentages to compare two things. For example, if a shirt is on sale for 20% off and costs $20, you can calculate the original price by dividing the sale price by 0.8 (1 - 0.2) to get$25.