Karen has a bookcase with 21  books. There are 3 shelves in the bookcase. Each shelf has the same number of books. How many books does each shelf have?

To find out how many books are on each shelf, you can divide the total number of books by the number of shelves:

\[
\text{Number of books per shelf} = \frac{21 \text{ books}}{3 \text{ shelves}} = 7 \text{ books per shelf}
\]

So, each shelf has 7 books.

Would you like more details or have any questions?

Here are five related questions:
1. If Karen had 4 shelves instead of 3, how many books would be on each shelf?
2. What if Karen had 25 books? How many books would each shelf have then?
3. If each shelf can only hold 5 books, how many shelves would Karen need?
4. If Karen adds 9 more books to her collection, how many books would each shelf have now?
5. What is the minimum number of books Karen needs to have an equal number of books on each shelf with 5 shelves?

**Tip:** When solving problems involving division, always ensure the remainder is appropriate for the context.

Discover how to calculate the number of books per shelf in Karen's bookcase problem. With 21 books distributed across 3 shelves, find out how many books are on each shelf with a step-by-step solution. Suitable for Grades 3-5.

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