These two short problems require children to apply their knowledge of time and each would make a good lesson starter or plenary.

What could you jot down or draw to help you?

What will Tom's watch say when the time is 7.57?

What will John's watch say when the time is 7.57?

Wonky Watches would make a good follow-up problem to these short challenges.

Having a clock to refer to, or some pictures of a clock face, will help children work on the first problem. A calendar might be useful for the second challenge.