This lesson teaches how to compare lengths by creating equal groups. It covers measuring lengths using equal units, such as bars, and highlights common mistakes like not aligning objects correctly. The video also demonstrates calculating the number of bricks needed for a path and dividing objects like boards and candy bars into equal parts. By the end, viewers learn to measure and divide objects accurately.

How long is each piece if a 12-centimeter candy bar is cut into 4 equal pieces?

What number added to itself equals 12, based on the lesson's explanation?