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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Answer:
3 (7+3)
Step-by-step explanation:
is the right answer
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