Groupable materials are proportional, and so are many pregrouped materials This helps children understand the place value relationships. Proportional materials are base 10 materials where a ten is physically the same size as 10 ones, and a hundred is physically the same size as 10 tens. Working with pregrouped materials is somewhat more abstracgt than working with groupable materials, and it further reinforces the base 10 structure of numbers. Pregrouped materials are base 10 materials where you can't physically take apart a ten to make 10 ones, and you can't physically take apart a 100 to make 10 tens.
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