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Biscuit Decorations

Andrew decorated 20 biscuits to take to a party. He lined them up and put icing on every second biscuit and different decorations on other biscuits. How many biscuits weren't decorated?

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Which Scripts?

There are six numbers written in five different scripts. Can you sort out which is which?

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The Deca Tree

Find out what a Deca Tree is and then work out how many leaves there will be after the woodcutter has cut off a trunk, a branch, a twig and a leaf.

A Mixed-up Clock

Stage: 2 Challenge Level: Challenge Level:1
Can you find a statement that gives you a definite number that you know is right? 
Can you now find some more that follow from this one?