Surds

In this video, Lucy introduces the concept of surds, which are square roots that cannot be simplified to whole numbers. She explains their importance in mathematics, particularly in maintaining accuracy in calculations, such as in Pythagorean theorem. The video covers how to identify surds, their usefulness, and provides a detailed explanation on simplifying surds using square numbers. Lucy also offers practice questions to reinforce learning and concludes with a preview of the next video, which will cover operations with surds.

How do you simplify a surd? Provide a step-by-step explanation.

What is the significance of knowing square numbers when working with surds?