Divide. Give the exact answer, written as a decimal. \( 1.8 \div 9=\square \)

To solve \( 1.8 \div 9 \), you can convert 1.8 into a fraction, which is \( \frac{18}{10} \). Now, dividing by 9 is the same as multiplying by \( \frac{1}{9} \). So, \[ \frac{18}{10} \div 9 = \frac{18}{10} \times \frac{1}{9} = \frac{18}{90} = \frac{1}{5} \] Now converting \( \frac{1}{5} \) into a decimal gives you \( 0.2 \). So, \( 1.8 \div 9 = 0.2 \). So the exact answer is \( 0.2 \).