How to find that last digit of big powers?

This is another video by me simantak
,my second video to be precise. here i explain how to find the last digit of a large exponential no. such as 9^500
this video will be helpful to many students if anybody needs any help with a math sum post it in the comments and i will reply with a solution video

[nicolasduck]

Thanks. Math is a unknown concept to me -_-