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Which times on a digital clock have a line of symmetry? Which look the same upside-down? You might like to try this investigation and find out!

Clock Hands

This investigation explores using different shapes as the hands of the clock. What things occur as the the hands move.

A Child Is Full of ...

My cousin was 24 years old on Friday April 5th in 1974. On what day of the week was she born?

Ten Green Bottles

Age 7 to 11
Challenge Level

We had very clearly explained solutions to Ten Green Bottles. David from Tithe Barn Primary School, Stockport wrote:

The answer is that the last bottle fell at five minutes to six. I worked this out by writing down the numbers 1-10 and by the first number I put the time when it fell. Then, I added 5 minute intervals and put them at the next number down i.e. 5:10, 5:15, 5:20 etc.

Jeff from Kelly Elementary School in Carlsbad, California agreed with the answer of 5.55.

Airlangga from St Joseph's Catholic Primary School wrote:

5.10 + (5minx9) = 5.55

Alistair from Histon and Impington Infant School used a similar way of working it out to David, but then generalises, leading nicely on from Airlangga's response:

I have spotted that the equation for the nth bottle is 5 x(n-1) minutes after 5.10

Very well thought out all of you.