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Say I have a fraction with 2 surds, such as √10 / √6. To rationalise this, we need to get the dominator (bottom fraction) to be an integer. As √10 / √6 x 1 still gives √10 / √6, and we can write 1 as √6 /...

Ian had a 5% rise, so £420 = 105% of his original pay 

To find 1% of his original earnings, divide £420 by 105.

Multiply this by 100 to find his old pay: 
1% of his original earnings =...