Montessori Mom

"The hands are the instruments of man's intelligence." — Dr. Maria Montessori

There is a magical moment in every young child's mathematical journey when they move beyond counting individual units and begin to understand that numbers are built from tens and ones. It's a profound cognitive leap — and in the Montessori classroom, this leap is made tangible, beautiful, and deeply understood through a pair of elegant wooden materials known as the Seguin Boards.

Named after Édouard Séguin, the French physician whose work with children profoundly influenced Maria Montessori, these boards transform the abstract concept of place value into something a child can see, touch, and construct with their own hands. Today, let's explore how the Teen Boards and Ten Boards work, where they fit in the Montessori math sequence, and how you can bring this powerful lesson home.

What Are the Seguin Boards?

The Seguin Boards come in two sets:

• Seguin Board A (Teen Board): This board helps children learn the numbers 11 through 19. It consists of a wooden frame with nine printed "10s" and a set of wooden number cards (1–9) that slide over the zero in each "10" to form 11, 12, 13, and so on.
• Seguin Board B (Ten Board): This board helps children learn the counting by tens — 10, 20, 30, 40, 50, 60, 70, 80, 90 — and then the numbers in between (21, 22, 23… all the way to 99). It features printed "10s" with sliding number cards, similar to the Teen Board, but structured for the decades.

Both sets are used in conjunction with golden bead bars (ten bars and unit beads), which give the child a concrete, tactile representation of the quantity each number symbol represents.

Where Do the Seguin Boards Fit in the Montessori Sequence?

The Seguin Boards are a cornerstone of the Montessori linear counting sequence in the Primary (ages 3–6) math curriculum. They typically come after a child has:

1. Mastered counting 1–10 with the Number Rods
2. Associated quantity and symbol using the Spindle Boxes and Cards and Counters
3. Been introduced to the decimal system through the Golden Bead Material
4. Explored the Bead Stair (colored bead bars 1–9)

After working with the Seguin Boards, children are prepared to move on to the Hundred Board, Bead Chains for skip counting, and eventually the Bead Frame for larger operations. The Seguin Boards serve as a critical bridge in what Montessori called the journey from concrete to abstract understanding.

Age Range

The Seguin Boards are typically introduced between ages 4 and 5, once the child demonstrates a solid understanding of numbers 1–10 and has had initial exposure to the golden bead decimal system materials.

Step-by-Step Presentation: Seguin Board A (Teen Board)

As with all Montessori presentations, invite the child to the lesson with warmth and anticipation. Work at a table with the Teen Board, the sliding number cards (1–9), and a box of golden bead bars (nine ten-bars and loose unit beads).

First Period: Building the Teen Numbers

1. Place one ten-bar on the table to the left of the board. Say, "This is ten." Point to the "10" printed on the board.
2. Place one unit bead next to the ten-bar. Say, "Ten and one."
3. Slide the "1" card over the zero in the first "10" on the board so it reads 11. Say, "This is eleven."
4. Repeat with 12 and 13, building the quantity with bead bars and units each time, then sliding the corresponding card into place.
5. Use the Three-Period Lesson to reinforce:
   • First period (naming): "This is eleven. This is twelve. This is thirteen."
   • Second period (recognition): "Show me twelve. Point to eleven."
   • Third period (recall): "What number is this?"
6. Continue in groups of three until all teen numbers (11–19) have been presented across multiple lessons.

Presentation: Seguin Board B (Ten Board)

The Ten Board presentation follows a similar pattern but introduces the decades:

1. Begin by building quantities with ten-bars: one ten-bar is 10, two ten-bars are 20, and so on.
2. Slide the appropriate number cards to form 20, 30, 40, etc.
3. Once the child knows the decade names, introduce the numbers between decades (21, 22, 23…) by adding unit beads and sliding unit cards into place.

Key Montessori principle: The child always builds the quantity first with the beads, then matches the symbol on the board. This ensures understanding moves from concrete to abstract — never the reverse.

4 Hands-On Activities for Home

You don't need the official Seguin Boards to begin exploring these concepts at home (though they are a wonderful investment). Here are activities that reinforce the same skills:

1. DIY Teen Board with Index Cards

Write "10" on nine index cards. Cut smaller cards with the digits 1–9. Let your child place the small card over the zero to "build" teen numbers. Pair each number with a corresponding quantity — use dried beans, buttons, or small pebbles grouped in tens and ones.

2. Ten-Bar and Unit Bead Building

If you have golden bead material or colored bead bars at home, invite your child to build quantities like 14, 17, or 23 and then write the number on a small slip of paper. This reinforces the quantity-symbol connection. You can also use craft beads strung on pipe cleaners in groups of ten.

3. Place Value Scavenger Hunt

Hide number cards around the house (numbers between 11 and 99). When your child finds a card, they must build the quantity using a collection of ten-sticks (popsicle sticks bundled in tens with rubber bands) and loose sticks for ones. This is active, joyful, and deeply mathematical!

4. The "Secret Number" Game

Build a quantity with bead bars and units (or bundled sticks) and hide it under a cloth. Give your child clues: "I have three tens and five ones. What's my secret number?" Let them lift the cloth to verify. Then switch roles — children love being the one to create the mystery!

Why the Seguin Boards Matter

In conventional education, children are often asked to memorize the names of numbers and their order without truly understanding what those numbers mean. A child may be able to recite "eleven, twelve, thirteen" without grasping that thirteen is one ten and three ones.

The Seguin Boards prevent this hollow memorization. Every time a child slides a "3" card over the zero in "10" and sees 13 — while simultaneously holding one ten-bar and three unit beads — they are constructing genuine mathematical understanding. They are seeing place value. They are touching the decimal system. And this deep, sensorial knowledge becomes the unshakable foundation upon which all future math — addition, multiplication, fractions, algebra — will be built.

Bring the Seguin Boards Home

Ready to add the Seguin Boards to your home Montessori environment? Here are two excellent options:

• Montessori Seguin Boards Set — A complete wooden Seguin Boards set for practicing teen and ten numbers
• Montessori Teen & Ten Boards Math Material — Educational wooden boards for learning place value concepts

A Warm Closing

The Seguin Boards remind us of something beautiful about Montessori education: that the most profound concepts need not be taught through lectures or worksheets. A simple wooden board, a few sliding cards, and a handful of golden beads — in the hands of a child who is ready — can open the door to an entire universe of mathematical understanding.

Watch your child's face the first time they build the number 19 and see it — that long, gleaming ten-bar beside nine little golden units. There's a spark there. A quiet "oh!" of recognition. That is the moment when mathematics becomes not something to be feared, but something to be loved.

As Maria Montessori wrote, "The child who has never learned to act alone, to direct his own actions, to govern his own will, grows into an adult who is easily led and must always lean upon others." With the Seguin Boards, your child isn't just learning numbers — they're learning to think independently about the beautiful, logical structure of our number system.

Happy counting, dear families!