Students have been working on reading and writing time with both analogue and digital clocks. We’ve now moved on to measuring elapsed time or time intervals. Today’s problem was:  Ben’s favourite TV show starts at 11:45 a.m. and lasts 1h 35min.  When will the show be over?

We have tried using three different strategies:  1. subtracting minutes and hours, 2. timeline, 3. manipulating a clock and explaining our actions.

Look at the solutions below.  Can you identify the strategies used?