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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.

First Connect Three

Stage: 2 and 3 Challenge Level: Challenge Level:2 Challenge Level:2

Are some numbers part of more lines of three than others? This might affect whether we aim for them or not.
How can you get $1$ by throwing the two dice? How many ways are there altogether?
How can you get $12$ by throwing two dice?
It might be useful to look at all the numbers on the grid in turn in this way.