Sand Timers

We had really cool fun in Maths because we got to make our own sand timers. The bottom was cut off a small plastic bottle and Pete drilled a small hole in the lid. Next we put some dry, fine sand into our containers and we timed the sand running out for one minute. A mark was put on the container catching the sand so we knew how much to put back into our timers. A minute actually takes a long time when you are watching the clock!