Rational Numbers. Powers and roots

# Rational Numbers

There are situations in which Whole Numbers are not enough:

- When a division is not exact.

- When I want to express parts of a unit

In these situations we need fractions. When we add the fractions to the Whole Numbers, we obtain the **Rational Numbers**, Q.

Now we have these sets of numbers:

We represent these in the straight line too.

For example, to represent 3/5:

- We draw a line from zero.

- We draw 5 marks at equal distance with a compass.

- We connect the last mark with 1 and draw the parallel lines.

**Exercise**: Represent these numbers in the number line: -7, 5, 1/5, -2/3, 7/3, 3/2, -9/5

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