Number (addition and subtraction): Frog vs Wasp

Challenge level ⭐

(designed for children with prior knowledge of the Year 3 programme of study)

Learning Objective

We are learning how to solve a natural world problem by using and applying our skills and knowledge of number and addition.

Useful prior knowledge:

• To add single and double digit numbers together using efficient strategies

https://www.bbc.co.uk/programmes/p04fyn5v/player

Credit: BBC One - Planet Earth II

Clip Description

Like butterflies, frogs undergo an incredible change as they grow up. From jelly-like eggs, they grow into water-living tadpoles before finally growing legs that are suitable for land. Worldwide, scientists have so far recorded 7,400 different species of frog. It is likely that new species of frog have yet to be discovered.

In this fascinating clip, a glass frog father can be seen protecting his precious clutch of eggs. The eggs are attached to a leaf. Once hatched, the tadpoles will fall into the water below and begin their incredible transformation. However, the father must first see off some pesky wasps that want to eat the eggs. How do you think he will do this? Watch the clip to find out.

Quick Whiteboard Challenge

From what you have seen in the clip, have a go at answering the following questions:

1) What is the average length of an adult glass frog?

A) 3 cm     B) 800 mm    C) 50 cm

2) Around how many glass frog eggs are there within a single clutch?

A) 10 – 20     B) 30 – 60    C) 600 – 1,000