Math in Elementary
Grades 1 to 6, for ages 6 to 12
Our elementary programs are truly unique: mixedaged Montessori communities, with multiyear age bands learning alongside one another. Within the Montessori framework, we embed a sequence of classical academic content in the humanities and the sciences, which motivates studentled projectbased learning.
The Purpose of Mathematics Education
Mathematics is a uniquely powerful discipline, one that enables us to comprehend and manipulate quantities of all sorts. Advanced mathematics is indispensable for certain very lucrative careers that it makes possible. Even in everyday life, fairly advanced mathematics—of the sort that, until recently in history, was learned by a tiny minority—is highly useful. From calculating measurements for a DIY project to working out how many weeks' pocket money is needed to buy a new video game, math is versatile and important.
However, the study of mathematics offers gifts far beyond numeracy and calculation. It allows children to develop and exercise their reasoning mind. It teaches students how to evaluate situations, mentally test hypotheses, employ problemsolving strategies, derive conclusions, and articulate them clearly. As has been recognized since the time of the Ancient Greeks, math serves as the best model for, and the best practice for, core aspects of human reasoning. These are critical skills that students will need in their future workplaces, in their personal lives, indeed in every aspect of navigating a world increasingly characterized by demanding, rapid change.
And so the key outcomes of math education in our elementary programs are twofold:
A deep understanding of the way numbers work and relate to each other, as well as the ability to manipulate them quickly and easily;
The acquisition of cognitive powers and habits that can apply to all other areas of one’s life.
Our students, in mathematics, gain:
Explicit competence in foundational domains of mathematics (see below for a content list), along with an intuitive number sense;
The ability to build new knowledge from previous knowledge (by rigorous mathematical inference);
The ability to organize knowledge into an integrated, hierarchical structure (e.g. logical chains);
The ability to deploy highly abstract knowledge in solving particular problems (e.g. word problems, heuristics, models);
The ability to participate in discussion and debate with others using clear, stepwise reasoning and truths (such as measurements and prior axioms).
Students who study math, in short, gain the ability to better form and deploy complex knowledge—in general. Whether its solving a difficult engineering problem or solving a thorny personal problem, one needs to be able to: identify and separate different operative factors, organize these factors, bring different elements of knowledge to bear on the problem in a systematic way, and pressuretest one’s thinking for mistakes, problems, and weaknesses. These are the skills that our elementary programs impart when teaching mathematics.
Our Mathematics Pedagogy
Our approach to math in the elementary years is guided by principles of intelligibility through handson learning, precision through thoughtful curricular materials, and mastery through engagement and practice.
Handson Learning
Our math curriculum begins with handson materials that foster an intuition of quantity, place value, and geometry. By manipulating these scientifically designed examples of abstract ideas, students build a library of experiences that develop into mental models of mathematical principles. A set of developmentally and mathematically refined handson Montessori learning materials, along with unique learning materials developed by our pedagogy team, forms the backbone of the math curriculum.
Each learning material not only concretizes but isolates an aspect of mathematics. The cleanliness and objectivity of math is manifest in the learning materials, and reinforced in the more abstract presentations. Definitions are clear and concise, statements are correct and precise, and problems are solved by laying bare every step. The precision and isolation in the materials allows students to practice one skill or concept at a time, repeated as often as needed for mastery.
A Developmental Sequence for Math
Our program is carefully sequenced to follow each student’s development. As the result of a thoughtfully ordered curriculum, the approach is intelligible to the student at each step. Our general pedagogy demands grounding knowledge in the child’s own experience, progressing from concretes that are directly accessible to the student, up to more abstract knowledge, with each stage providing the foundation for the next.
Math is no exception. Each material, lesson, and activity builds on the strong foundation of the previous ones, and seeds are continuously laid to facilitate integrations years later. The binomial cube, for example, presented as a puzzle for Montessori preschool students, leads to a geometricalgebraic integration of binomial expansions.
Math in Our Classrooms
The basic implementation of mathematics follows a sequence of teacher presentations and student activities in accordance with the guidelines above: engaging, handson, manipulationbased learning, with precise mathematical content that is crystallized into concepts, done at a pace that is challenging and in an order that is accessible. In addition, key units are punctuated by group discussions, guided by the teacher in a way that clarifies and unifies the knowledge of the students.
The highestlevel goals of mathematics education in our elementary program are the cognitive ones listed above. The specific mathematical content that represents the realization of those goals in elementary are:

Fluency with nonnegative rational numbers and operations. Students in our programs develop a clear concept of nonnegative integers, fractions, and decimals and can abstractly manipulate them in any combination using addition, subtraction, multiplication, and division. In addition to providing important material for mathematical reasoning and discussions, this content paves the way to fluency with all real numbers in algebra.

Basic skills and knowledge in equations, algorithms, and geometry. These topics prepare students for algebra, coding, planimetrics, and stereometry. Combined with nonnegative rational number arithmetic, these constitute the foundation of all higherlevel mathematics.
The topics covered in lower elementary are:

Mathematical Conversation (equality and basic operations)

The Decimal System, Categories and Numeration

Addition

Subtraction

Multiplication

Division

Introduction to Coding

Fraction Prerequisites

Preliminary Sensorial Work with Fractions, Exponents, and Squaring
The content covered in upper elementary is:

Fractions

Mixed Numbers

Decimals

Ratios and Proportions

Graphing

Exponents

Negative Numbers