Rationalising the denominator
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We rationalise the denominator to ensure that it becomes easier to perform any calculation on the rational number. When we rationalise the denominator in a fraction, then we are eliminating any radical expressions such as square roots and cube roots from the denominator.
Definition
Rationalising is the process of multiplying a surd with another similar surd, to get a rational number. The surd that is used to multiply is called the rationalising factor.
- To rationalise we need another ,
- To rationalise we need a rationalising factor ,
- To rationalise he rationalising factor of 2√3 is √3: 2√3 × √3 = 2 × 3 = 6.
Rationalise the Denominator Meaning
Rationalising the denominator means the process of moving a root, for instance, a cube root or a square root from the bottom of a fraction (denominator) to the top of the fraction (numerator). This way, we bring the fraction to its simplest form thereby, the denom