Hundreds and Tens
Thousands and Ones.
The way I understand it, they are designed so you can overlay them to form numbers.... for example, 2345 would be a 2000 on the bottom, then a 300 hundred, then a 40 then a 5. That would give children a concrete sense of place value and how it works.
... Units are in green, tens in blue, hundreds in red and thousands in green again because thousands are the "units" of the thousands period (1 thousand, 10 thousands, 100 thousands). I got this information from Elizabeth Hainstock's Montessori in the Home.
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