Today's lesson will be about checking answers to questions. One of the nice things about maths is you can check your own answers to see if you have got a question wrong or right. However, just checking by doing the same question again may mean you make the same mistakes you have made again. So it helps if we can check an answer by doing a different question. We have explored different ways to do this before, but let's revisit it today with this video, and the activities below.