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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

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Making Shapes

Age 5 to 7 Challenge Level:

I have three counters.  I arrange them on a grid to make a rectangle like this:

 
I wonder if there are any other rectangles I could make with just three counters?

If I had six counters, I could make a rectangle like this:



Are there any other rectangles that I could make with six counters?

Imagine you have $18$ counters to put on a grid.

Arrange any number of counters on the grid to make a rectangle (not just its outline).
How many different rectangles can you make with each number of counters?