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# Teens Boards

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3. Mathematics
4. Linear Counting
5. Teens Boards

#### Material

Two wooden slatted boards with 5 partitions each; on nine of the partitions a large 10 is written in black. The last partition is empty.
Loose wooden cards with numbers 1 to 9 which slide into the boards to cover the zero of each 10.

#### Presentation

1. Invite the child to the lesson.
2. Ask the child to lay out a rug.
3. Show the child the teens boards box.
4. Bring the box to the rug.
5. Place the box horizontally at the top of the rug, with the rug laid out vertically.
6. Take the boards out.
7. Place the boards linearly, so that they are in a column touching. Be sure that the empty section is at the bottom.
8. Take the number cards out and place them randomly in a column on the right.
9. Find the 1 card.
10. From the right side, slide the 1 card into the first 10 section of the board.
11. “If I put 1 and 10 together, it says 11.”
12. Leave the 1 card in the board.
13. Repeat the same process for the 2 card in the next board section.
14. Leave the 2 card in the board.
15. Repeat the same process for the 3 card in the next board section.
16. Process with a three-period-lesson, the board limits where you can move the numbers but proceed as follow:
This is 11, this is 12, this is 13.
Ask the child to point to a number you name, such as “Show me 12.”
Take the cards out and ask the child to make a number, such as “Can you make 11? What is it?” Ask the child to name the numbers, “What is this?”
17. On another day, verify that the child knows 11, 12, and 13, and continue this process with 14, 15, and 16.
18. On another day, verify that the child knows 12, 13, 13, 14, 15, and 16, and continue this process with 17, 17, and 19.
19. Once the child knows 11 – 19 on the boards, ask him to put the cards in their places, read them from 11 to 19, then ask him to read them backwards.

#### Exercises

Child works independently.

#### Purpose

To introduce the symbols for the numbers 11 – 19.
To associate the symbol with a spoken name.

#### Control of Error

Child’s secure knowledge of 1 – 9.

4 1/2

#### Notes

When doing beads we put a 10 bar and color bead together to make a number, but here we are taking a number and covering a zero which reinforces the child’s understanding of the decimal system.