**Estimation** is an important part of mathematics. But we don’t just make random guesses – we follow systematic methods in order to be able to estimate a number to a certain number of decimal places.

Let’s suppose we wanted to know the square root of 3 to **one decimal place**. How would we go about it? (do we know what **one decimal place** means?)

Do we know what is a cube root? How would we find the cube root of 16 to one decimal place?

**Exercise**

Let’s complete exercise 4D from pages 63 and 64 of the textbook. Remember to be systematic and to show all of your working. You must **not** use a calculator for this exercise.

The answers are below: