Montessori Math

The Lesson AlbumThe Decimal System · lesson 2ages 4–6grades PK–K

Introduction to the Number Cards

Your child has already held one golden bead and hefted a cube of one thousand; now they meet the written symbols 1, 10, 100, and 1000. This short naming lesson attaches numerals to the quantities they already know with their hands.

Materials

  • The four large number cards: 1, 10, 100, and 1000. No special set needed — cut four cards from an index card or cereal box, each one digit wider than the last, and write 1 in green marker, 10 in blue, 100 in red, and 1000 in green.
  • A small mat, tray, or dish towel to lay the cards on.
  • The golden bead quantities for pairing if you have them — one bead, a ten-bar, a hundred-square, and a thousand-cube (the virtual Golden Beads on this site can stand in).

No materials at home? Use the virtual Large Number Cards or Golden Beads & Mat.

Before this lesson

Aims

Direct

  • Learn the written symbols for 1, 10, 100, and 1000 and their names.
  • Meet the color code of the decimal system: green for units, blue for tens, red for hundreds, and green again for thousands.
  • Notice that each place adds one more zero.

Indirect

  • Prepare for pairing symbol with quantity in the formation of numbers.
  • Prepare for composing large numbers by stacking cards.
  • Build the habit of reading a number by looking at its places, which underlies all later written arithmetic.

Presentation

  1. 1 Invite your child to the table and lay the four cards in a row, 1 on the right and 1000 on the left, just as places sit in a written number.I have some new cards to show you today.
  2. 2 Point to the 1 card and name it. Let your child trace the numeral with a finger.This is one.
  3. 3 Point to the 10 card. Trace the 1 and then the 0, counting the zeros aloud.This is ten. Ten has one zero.
  4. 4 Point to the 100 card and trace it the same way.This is one hundred. One hundred has two zeros.
  5. 5 Point to the 1000 card and trace it.This is one thousand. One thousand has three zeros — see how long the card is?
  6. 6 Second period — play with the names. Mix the cards up on the mat and give little commands, one at a time, many times over: show me, point to, hand me, put it by the window. This game is where the learning happens, so stay here as long as it is fun.Show me ten. Now put one hundred on my hand.
  7. 7 Third period — only if the second period went easily. Point to one card at a time and let your child name it. If they hesitate, cheerfully go back to the show-me game another day.What is this?
  8. 8 If you have golden beads, lay the matching quantity under each card: one bead under 1, a ten-bar under 10, a hundred-square under 100, a thousand-cube under 1000.One bead — and this card says one.

Points of interest

  • Each card is one digit longer than the last — they make a little staircase when lined up.
  • The colors change with the place: green, blue, red, then green again.
  • Counting the zeros to tell the cards apart.

Control of error

  • The number of zeros on each card tells your child which is which.
  • The colors of the numerals confirm the place.
  • When paired with the golden beads, a mismatch is obvious — a single bead under the 1000 card looks plainly wrong.

Vocabulary

  • unit
  • ten
  • hundred
  • thousand

Variations

  • For a younger child, present only 1 and 10 the first day and add 100 and 1000 later in the week.
  • Play the fetching game at a distance: place the cards across the room and ask your child to walk over and bring back the one you name.
  • Trade roles — your child gives the commands and you point (and occasionally get it charmingly wrong for them to correct).

Extensions

  • Zero hunt: write 1, 10, 100, and 1000 on paper and have your child circle and count the zeros in each.
  • Card-and-quantity memory: lay the four cards face down next to the four bead quantities and let your child match them from memory.

Follow-up work (pencil & paper)

  • Have your child copy the numerals 1, 10, 100, and 1000 with crayons in the Montessori colors — green, blue, red, green — saying each name aloud as they write.
  • Print a place-value practice page and have your child match numerals to place names with a pencil.Printable: Place Value & Expanded Form

What comes next

When your child can name all four cards easily, move to the Formation of Numbers with the golden beads (lesson 3 in this strand), where quantities and cards finally come together — and after that, the full bird’s-eye layout of every card from 1 to 9,000.

Next in this strand: Building Big Numbers (Formation)