Used for comparing data sets, where the height or length of bars represent specific values.

Often called "strip diagrams," these are vital for understanding "part-part-whole" relationships, which are foundational for mastering multiplication and division. Target Sampling Mathematics Grade 3 - Oregon.gov

They help students quickly assess the ratio between several quantities.

In the 3rd-grade curriculum developed by Zakharova and Iudina for the "Prospective Primary School" (Perspektivnaya Nachalnaya Shkola) system, diagrams are not just illustrations; they are essential mathematical models.