Montessori Primary Program (Ages 3 to 6)

2 min read Updated November 2026

A boy builds a pink tower of cubes on a red mat in a bright classroom
Building the pink tower, a classic primary-age material. Photo: Pexels contributor / Pexels, Pexels License

The foundation years of Montessori education, when children build core skills and independence

Program Overview

The primary or Casa program is the level most families meet first. Children stay in the same mixed-age class for three years, which lets them move through the materials at their own pace and take on the role of older helper in their final year.

AMI standards for this level call for a class of 24 to 35 children, one AMI-trained teacher, and a three-hour uninterrupted work period on five mornings a week (AMI/USA standards).

Tip. Other schools set their own class sizes and staffing, so ask about both when you visit.

Core Curriculum Areas

Academic Foundations

  • Reading and writing
  • Mathematics
  • Cultural subjects
  • Sensorial development

Life Skills

  • Practical life exercises
  • Social development
  • Independence
  • Grace and courtesy

Key Learning Areas

Language Arts

  • Phonetic reading
  • Writing development
  • Grammar introduction
  • Literature appreciation
  • Vocabulary enrichment

Mathematics

  • Number recognition
  • Decimal system
  • Basic operations
  • Geometry concepts
  • Mathematical reasoning

Daily Schedule

Morning

  • Independent work time
  • Individual lessons
  • Small group work
  • Outdoor activities

Midday

  • Practical life activities
  • Cultural lessons
  • Lunch and cleanup
  • Rest or quiet time

Afternoon

  • Art and music
  • Group projects
  • Garden activities
  • Story time

Developmental Milestones

Good to Know. Children reach these steps at different times. The years below describe a common pattern, not a checklist.

First Year (3-Year-Olds)

  • Settling into the classroom
  • Basic practical life skills
  • Sensorial exploration
  • Language enrichment

Second Year (4-Year-Olds)

  • Preparation for reading
  • Early mathematical concepts
  • Cultural awareness
  • More complex practical life work

Third Year (5-Year-Olds, the Kindergarten Year)

  • Reading and writing for many children
  • Work with larger numbers and the four operations
  • Helping and leading younger classmates
  • Longer projects
  • Preparation for elementary

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