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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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Constant Counting

You can make a calculator count for you by any number you choose. You can count by ones to reach 24. You can count by twos to reach 24. What else can you count by to reach 24?

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Number Detective

Follow the clues to find the mystery number.

Making Shapes

Age 5 to 7 Challenge Level:

How about starting with a small number of counters and working up?
How will you know that you haven't missed any out?