2x tables:   https://www.youtube.com/watch?v=BGWMPqh04o4&t=2s

5x tables:   https://www.youtube.com/watch?v=gfRVYPcfecE&t=6s

10x tables:   https://www.youtube.com/watch?v=8yxMJUHBslY

3x tables:   https://www.youtube.com/watch?v=dzVyBQ5uTbo

4x tables:   https://www.youtube.com/watch?v=lBmSshEDVnQ

8x tables:   https://www.youtube.com/watch?v=kN3RG5iLKpo&t=32s

6x tables:   https://www.youtube.com/watch?v=iLln96C-BxY

7x tables:   https://www.youtube.com/watch?v=t4xU4CiaGvg

9x tables:   https://www.youtube.com/watch?v=NCoFSkG3XqI

11x tables:   https://www.youtube.com/watch?v=dNHC-oU8tt8

12x tables:   https://www.youtube.com/watch?v=9TSbNpPW1E4