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# LESSON 2 Wholes and Parts

Irma told her friends that she ate half of a cake yesterday. They all had a different idea about what that meant.

- If each student shown here is thinking of of a cake, why are all the pieces of cake different sizes?

## Numerators and Denominators

The **denominator** of a fraction tells us to divide the whole into that many equal parts. The 4 in the fraction shown above tells us to divide the whole into four equal parts (fourths).

The **numerator** tells us the number of parts to consider, so the 3 tells us we are interested in three of the parts.