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SKU: 7077A

Regular price $46.00 USD
Regular price $46.00 USD Sale price $46.00 USD
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Large wooden board used to teach numbers to 20, including the place value of teen numbers. Blocks can be purchased separately.

Grade Level: K and 1

Concepts Explored

Numbers 1-20 and Addition/Subtraction


Our products are made of heirloom quality wood and can be passed from generation to generation. Products are finished with either a clear protective coating or paint. Each coating has been stringently tested for safety and exceeds US safety standards.

Shipping & Returns

Our current lead time is 2 weeks.

However, we are still affected by the Covid-19 supply chain issues.

You have 30 days to return any new, unopened items. Customers credited for products, but are responsible for return shipping and handling.

choking hazard

contains small parts. not for children under 3 years

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Associated Materials

    Teaching with the 20 Tray

    The 20-Tray demystifies the difficult teen numbers by demonstrating that the sequence and concepts they have internalized regarding numbers 1 to 10 extend to higher numbers, as well. Children discover that the numbers 11-20 are made of ten and some ones, and that the combinations of ten apply to make combinations making twenty e.g. (4+6=10, so 14+6=20).

    The 20-Tray is used to demonstrate:

    • Understanding of teen numbers
    • That all teen numbers are made of a ten and some ones
    • Counting forwards and backwards within 20
    • Fluency with adding 10 and 9 to any number
    • Combinations of 20


      Building the 20-Stair

      Children discover the role of 10 in each teen number as they build the stair from 1 to 20. They name the blocks in each step, such as 10 and 5, and then give their sum, 15. In this way they all understand the composition of each number from 11 to 20.