After estimating when the area is exactly half covered by blue squares go rewind the video to help determine when it really is half covered.
The images below are to help you extend your discussion around fractions. In each picture which colour covers more area? How do you know? What fraction is covered by blue? Yellow? What percent? How many more yellow/blue will make an equal amount colour showing?
Interested in taking a deeper dive into representing and comparing fractions? I’ve put together a full problem based unit involving representing and comparing fractions that you should definitely check out.