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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?

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?

Number Detective

Follow the clues to find the mystery number.

Six in a Circle

Age 5 to 7 Challenge Level:

Perhaps finding a way to record this might be useful? How about using numbers $1$ to $30$ on bits of paper and arranging them?

Is there a link to factors and multiples which may help?