Home | KS2 Maths Lessons | Year 6 maths | Tenacious Turtles

# Column addition 6: Tenacious Turtles

## Learning Objective

We are learning how to add numbers with more than 4 digits using the formal written method of column addition (more than one exchange).

Context: Tenacious Turtles

https://www.bbc.co.uk/programmes/p06btfyx/player

Credit: BBC Four - Nature's Turtle Nursery: Secrets of the Nest

## Clip Description

An arribada (Spanish for ‘arrival’) is a truly spectacular site. It involves thousands of female turtles, all leaving the ocean at the same time to lay their eggs in the sand. Incredibly, the females return to the same beach on which they hatched.

In this fascinating clip, we are shown an arribada of olive ridley turtles. We learn that the number of females arriving on a particular stretch of coastline in Costa Rica can range from 50,000 turtles to a peak of 300,000 turtles.

## Whiteboard Number Challenge

In the clip, we are treated to an incredible turtle mass gathering called an arribada.

Give each letter of the word ‘arribada’ a number according to its place in the alphabet.

e.g.  A = 1     Z = 26

What is the total value of this word?