It seems that the White Rose website is not working very well this morning! Apologies for this. Here is a link to another video that should explain percentages and should allow you to complete the activities that were set for lesson 3 of week 2. I have saved these below. https://www.youtube.com/watch?v=CReZJe_Qj5Y . This BBC bitesize sets of clips should help too: https://www.bbc.co.uk/bitesize/topics/znjqtfr. The other videos seem to be working today.
This is the link to the White Rose Home Learning page again: https://whiterosemaths.com/homelearning/year-5/
I will check that they are working tomorrow morning and if not I will post some links to some other videos to explain these concepts.