Rationalising the denominator when the denominator has a rational term and a surd If the denominator of a fraction includes a rational number, add or subtract a surd, swap the + or – sign and ...

sqrt{3} = 1.732050807568877\) ... \(\pi = 3.14159\) ... Roots that cannot be written as exact decimals are called surds. Leaving an answer in surd form means the answer is exact. This square has ...