FYI, Barb’s first playlist of instructional videos (the missing number 1 from above) are all about Math instruction rather than Dance. Below are some links for that:
a. Fractions: https://youtu.be/NwCV-tP7zzg      https://youtu.be/tsNbXmnkuHs
b. Positive & Negative Numbers:   https://youtu.be/UXnk9FgaS2w   https://youtu.be/aG53Dlc4U9k
c. Percentages:    https://youtu.be/6unY1u6n20M     https://youtu.be/EU1vtCI7TYQ
d. Decimals:   https://youtu.be/8vL7UsLSOjQ
The Math Playlist Link is:  https://www.youtube.com/playlist?list=PLJnlHnMfogFLnbKaja2Z2hU0ouIRY_hFo
Looking for Math instruction? Try MathTeacherHelp.com