UK Secondary (7-11)
Rationalise the denominator

## Interactive practice questions

Fill in the blanks to complete the question below.

The number $\sqrt{\frac{2}{7}}$27 can be rewritten without a radical in the denominator by multiplying both the numerator and denominator by $\sqrt{\editable{}}$.

Easy
Less than a minute
$\frac{1}{\sqrt{11}}$111
Rationalise the denominator and give your answer in the simplest form: $\frac{7}{\sqrt{21}}$721