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History, 30.11.2020 22:50 roorootx

The model shows the addition expression 18 + 12. A model containing 3 rows of 6 orange squares and 3 rows of 4 blue squares. One expression that is equivalent to this sum is .

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The model shows the addition expression 18 + 12. A model containing 3 rows of 6 orange squares and 3...

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