Learn about and revise surds, including how to add, subtract, multiply and divide them, with this BBC Bitesize GCSE Maths Edexcel study guide.

M. D. Hendy, Applications of a Continued Fraction Algorithm to Some Class Number Problems, Mathematics of Computation, Vol. 28, No. 125 (Jan., 1974), pp. 267-277 ...

If the denominator of a fraction includes a rational number, add or subtract a surd, swap the + or – sign and multiply the numerator and denominator by this expression.