Mathematics, 10.03.2020 06:01 SophieStar15

The model shows the expression 21 + 9. A model with 3 rows of 7 squares and 3 rows of 3 squares. Which expression is equivalent to this sum? 3 (7 + 3) 3 (7) + 3 3 + 7 + 3 7 (3 + 3)

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The model shows the expression 21 + 9. A model with 3 rows of 7 squares and 3 rows of 3 squares. Whi...

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