Math manipulative board - 1 to 20 arithmetic board - wooden twenty board - Montessori primary

made to order


Number manipulation extension to our cloud ten counting board.

Each cloud has 20 raindrops 🌧

I have added a lighting in the middle of each set of raindrop for
(1) Subitizing
(2) exploring symmetry

You can add and subtract the raindrops.

Or compare which one has more raindrops and add the larger than/lesser than signs.

Just like the cloud ten frame, the intensity of cloud increases and decreases based on the number. Larger the number, higher the intensity.

Comes with
The math manipulative board
42 blue balls aka "raindrops"
22 Numbers aka "clouds" 1-20, 0 and an extra 10.
5 symbols +,-,<,> and =

Board is made of maple and finished with linseed oil. Balls are 0.75" round.

Shipping and returns


  • Turnaround time depends on the product, generally it ranges from 2-4 weeks.
  • Free US shipping on orders over $200 USD (8-10 days transit)
  • $8.95 regular shipping (8-10 days transit)
  • You can upgrade to shorter shipping at checkout.
  • Please contact me if you have a deadline, I will try my level best to work with you and make them asap <3


  • Rates calculated at checkout, please get in contact with us if you have any questions.
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Default Title / $59.95