Home | Lesson Archive | Year 3 Maths Archive | L3: bat volcano

# Fractions of quantities: L3: bat volcano

## Learning Objective

• We are learning how to solve problems that involve finding unit fractions (halves, thirds, quarters, fifths, sixths) of a set of objects.

Context: bats

https://www.bbc.co.uk/programmes/p0529bp9/player

Credit: BBC Two - Mexico: Earth's Festival of Life

## Clip Description

There are more than 1,300 different bat species. After rodents, bats are the second most common group of mammals. Some, like the bumblebee bat, weigh less than a penny. Others, like the giant golden-crowned flying fox, have a wingspan of almost 2 metres!

In this fascinating clip, we are taken on a journey, deep into the heart of a Mexican rainforest. In the forest, there is a limestone cave nicknamed the ‘Bat Volcano’. It’s not an actual volcano, but it is home to around 3 million bats. When the bats leave the entrance of the cave, it’s like a swirling eruption against the sky’s fading light. It’s a jaw-dropping wildlife spectacle! Why do you think the bats leave the safety of their cave? Watch the clip to find out.

## Whiteboard Number Challenge

Three million is a huge number! However, you could easily impress your friends by saying your 3 million times table by simply knowing your 3 times table.

e.g. One times 3 million equals 3 million, two times 3 million equals 6 million …