Marilyn Burns is one of my favorite education authors.
The Greedy Triangle is a great book for grade school kids that includes the shapes of Montessori's geometric cabinet. It's an imaginative way to look at shapes. This would be a great book for kids ages 6 and up. It's a fun way to look at geometry.
Here are some other great resource books written by Marilyn Burns- The Book of Think has great extensions for all subject areas. It's a great way to introduce problem sloving.
Math for Smarty Pants is full of great math extensions that would work well in a Montessori elementary classroom. It's creative and fun with mathmatical magic!
The I Hate Mathematics Book! appeals to kids who really dislike math.
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