Surds introduction

What you'll learn

1. 1

   Imagine you have a square piece of paper with area 5. Its side length is √5 — that's a surd!

2. 2

   Which of these is a surd?

3. 3

   Drag the slider to show √5 on the number line — it's between 2 and 3.

4. 4

   Simplify √12 by finding square factors.

5. 5

   Now simplify √18 — drag the factors to find the square part.

6. 6

   What is √18 simplified?

7. 7

   Which is bigger: √7 or 2.6?