### Lesson Summary:

The lesson introduces the children to the square roots of whole numbers. The discussion is designed to be read individually or in pairs. In Activity A the children are given the opportunity to experiment with squares, square numbers and square roots using manipulatives. In Activity B they are required to provide the square root of given numbers. In both activities they are encouraged to check their own answers by working out the square of the number.

### Objectives:

- The children will understand and be able to explain the concept of squares, square numbers and square roots.
- The children will be able to demonstrate their understanding by calculating the square roots of given numbers.

### Subject Area:

Math

### Lesson Excerpt:

Do squares have roots? Well, of course, they don’t have the same roots that plants have, despite the rather silly picture on the right. Before we can decide what a square root is, we need to be sure we know the **definition** of a square. So, what is a square? See if you can answer this before reading the next sentence.

A square is a **geometrical** figure which has four right angles and four equal sides. That means that all you need to know to be able to draw a square is the length of one side. Now you have a definition of a square, do you know what a square number is? If you’ve already worked with areas, you’ll know that a square number is the number of square things that can be arranged in a bigger square.

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