Placing number forms on a large circle with beanbags and then tracing the forms by walking the numbers can be effective for both learning the forms and preventing reversals. Young children learn especially well with this sort of whole-body approach. This method can also be used for learning correct letter formation. directions in my comments idea from Mathbyhand.com

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Age 8 ~ Math ~ Skip Counting ~ Circle Chart ~ main lesson book

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Such a simple (very Montessori) game. You can also do this with dice for younger kids instead of cards.

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Serendipity: Gnomes and Gnumbers: A Mathematical Tale

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Waldorf ~ 6th grade ~ Math ~ Geometry ~ Circles

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Skip Counting Number Wheel - Waldorf Math. I've never seen this before and it looks fun!

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A more exciting and visual way to teach place value: Place Value Castles and knights!

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Waldorf ~ 2nd grade ~ Math ~ Facts ~ Multiplication Wheel

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How to Make a Waldorf Skip Counting Board | From Blue Bells and Cockle Shells

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“A friend was asking me about these today and it struck me to share the Waldorf multiplication flowers here again too (sorry to those who have seen this 3…”

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