RATIONALISATION OF DENOMINATOR

• There are many expressions having square roots in their denominators. If the denominators are free from square roots then addition, substraction, multiplication and division will be more easy. 
• Rationalisation means the conversion of denominator into a rational number.
• You have to multiply both numerator and denominator by irrational number to make the denominator rational.
• The number multiplied is called rationalisation factor.