# Maths KS2: Mental multiplication

While exploring a jungle, Olivia and Hassan learn the true nature of square numbers as being created when two of the same number are multiplied together.

Baffled at the thought of a square number, Oliva and Hassan start by mistakenly looking for numbers which look like squares.

With the direction of Archimedes however, they learn the true nature of square numbers as being created when two of the same number are multiplied together.

This short animated film is from the BBC Teach series, Hypatia's Mathematical Maze.

### Teacher Notes

Before watching the film

Prior to this lesson you may wish to introduce students to other relevant topics, for example:

• Times tables up to 12
• Multiplication and division represented by arrays

During watching the film

Depending on the focus of the lesson, you might wish to pause the film in certain areas to check for understanding, asking questions such as:

• What other square numbers are there?
• How would you define a factor?
• How would you define a prime number?
• Is 1 a prime number?
• Can you answer Hypatia’s final question?

Final question:
Is it always, sometimes or never true, that square numbers have an even number of factors?