NUMBEROCK
Prime, Composite, and Square Numbers
Jeremy skateboards, does parkour, and even magically elevates in this fun video about the definitions of prime, composite, and square numbers. Then his friend Jenny helps him out in each chorus to make the song catchy in a way that won't...
Khan Academy
Khan Academy: Finding Factors and Multiples
Sal Khan uses divisibility rules to determine if numbers are factors of 154 and then finds multiples of 14.