Cardinality is critical for young children’s understanding of the base ten number system. They see that larger quantities that are 10 or more can be organized into at least one group of ten. When there is one ten and some ones that don’t make another ten, the teen numbers 11 to 19 can be composed.
The card set contains:
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10 picture story cards used for counting and developing decomposition and composition of numbers
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2 sets of ten-frame cards from 0 to 10 in two colors (red and green)
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2 sets of numeral cards from 0 to 10 in two colors (black and green)
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1 set of double ten-frame cards representing teen numbers from 11 to 20
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1 set of teen number numeral cards from 11 to 20