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# Multiplication (tables): Private: 10x: decapods

## Learning Objective

We are learning how to multiply by 10.

Context: decapods

https://www.bbc.co.uk/programmes/p05nzsbw/player

Credit: BBC One - Blue Planet II

## Clip Description

What do the words decade, decathalon and decagon have in common? That’s right – they all start with the prefix dec-. It means ten. A decade is a period of ten years, a decathlon is a competition in which athletes compete in ten different sporting events and a decagon is a shape with ten straight sides.  Have you heard of the word ‘decapod?’ A decapod is an animal that has ten legs. Crabs, shrimps and lobsters are all decopods. In many of these decapods, the front pair is often bigger with claws or pincers at the end to assist with feeding and for self-defense.

In this fascinating clip, an army of decapods  is on the move. These long-legged decapods are  called spider crabs.  Like most crabs, the spider crab’s body is enclosed by a hard, shell. To grow, they must shed (get rid of) their old shell to make way for a new one.

## Whiteboard Number Challenge

The answer is 10, what could the question be?

(Challenge yourself to find ways of making 10 that you think no one else will have thought of.)