Perimeter Exploration

Perimeter connects measurement to geometry, providing a real-world application of addition and length measurement.

• Framework: Montessori
• Unit: Mathematics
• Learning area: Geometry
• Level: Ages 5-6

Objectives

• Understand perimeter as distance around
• Measure perimeters of shapes
• Compare perimeters

Materials

• String
• Rulers
• Geometric shapes (flat)
• Recording sheet
• Tape

Instructions

1. Present rectangle. 'How far is it around the outside?' 2. Lay string around edge. Mark and measure string. 3. 'That's the perimeter.' 4. Measure each side with ruler. Add lengths. 5. Compare string method to ruler method. 6. Find perimeters of different shapes. 7. Compare: 'Which shape has the longest perimeter?'

Educator tip

Start with string (concrete) before measuring sides (more abstract). The string method builds intuition.

Assessment

Child measures perimeters using both string and ruler methods.

More from Mathematics

• Area Introduction with Unit Squares
• Place Value Chart Building
• Number Composition and Decomposition
• Ordinal Numbers
• Rounding to Nearest Ten
• Even and Odd Patterns in Addition
• Capacity and Volume Exploration
• Temperature Reading