The Rectangle

This Montessori geometry material presents a focused study of the rectangle as a specific type of quadrilateral within the larger Study of the Quadrilateral sequence. Students examine the structure and measures of the rectangle using precise mathematical language and simple black-line diagrams that support abstraction and require careful reading.

The set introduces the sides, angles, and vertices of the rectangle, along with the base, perimeter, area, altitude, and diagonal.

Concepts included:

• Sides, angles, and vertices of the rectangle
• Base, perimeter, and area of the rectangle
• Altitude of the rectangle
• Diagonal of the rectangle

What’s Included

Each concept is presented through four carefully sequenced stages, allowing students to move from supported reading to independent recall:

Stage 1: Supported Reading

• Picture cards with labels
• Description cards with the key term underlined

Stage 2: Independent Reading

• Picture cards without labels
• Complete description cards without underlining

Stage 3: Active Recall

• Picture cards without labels
• Description cards with the key term missing
• Separate name labels for matching

Stage 4: Three-Part Cards

• Picture cards
• Label cards
• Control cards for self-checking

This progression allows students to build confidence, accuracy, and precision of mathematical language.