Scratch Tutorial: Using Random Numbers
Channel: Chris Pautler
Date: 31/01/2018

https://scratch.mit.edu/projects/200968100/#editor
This one is a little long.  You could just watch the first part for a general idea about random numbers
Part 1(0-2:40)-Moving to random locations(Scratch Cat) 
Part 2(2:40-end)-Pick a random number game.(Pico)

This is one of many Scratch Tutorials 
See them all at:
https://goo.gl/pKA7vN

If you have ideas for other scratch tutorials, I welcome your suggestions