easy but it is not so much for students who do not know how to say the time in their own language. I hope this helps me and other teachers explain how to do it in an easy way. I made this infographic with a picture editor which you can find online and is free (except for some features) called PicMonkey, very easy to use.
In order to practise this issue, I strongly recommend the British page Teaching Time, with its demos Stop the Clock and Bang on Time, which students love.
So, what's the time?