Double, double then double again - a 8 times table trick.
Other Times Tables Tricks
2s – https://www.youtube.com/watch?v=A0NW7pups4E
10s – https://www.youtube.com/watch?v=iov5zX7PwKo
5s – https://www.youtube.com/watch?v=nsaiYPhqe_M
4s – https://www.youtube.com/watch?v=j_cuQxnX7-w
3s – https://www.youtube.com/watch?v=9m-YPvK9yMc
6s – https://www.youtube.com/watch?v=n6eDzpmgAk4
9s – https://www.youtube.com/watch?v=6_vcIXvWowM
