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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?
Age 5 to 7
Challenge Level
Here is a maze made from hexagons:
You need to go from the centre to one of the outside hexagons in two steps.
You start in the centre at $0$.
The next hexagon you visit must be a multiple of $2$.
The next hexagon you visit must be a multiple of $5$.
What are the possible paths you could take?
This sheet of hexagons may be helpful.
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NRICH is part of the family of activities in the Millennium Mathematics Project.
NRICH is part of the family of activities in the Millennium Mathematics Project.