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Calendar Sorting
Age 7 to 11
Challenge Level 
How might you start?
What do you know about the number of days in each month?
What do you know about the number of days in each month?
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Times
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.
Ten Green Bottles
Do you know the rhyme about ten green bottles hanging on a wall? If the first bottle fell at ten past five and the others fell down at 5 minute intervals, what time would the last bottle fall down?