Mathematics, 30.06.2021 03:30 diamondd4

There are 21 bags with 2 marbles in each bag, Ben calculates the number of marbles there are in all by counting by twos 21 times: 2.4, 6, 8, 10, ..., 40.42 Kaia calculates 21 + 21 = 42 instead. Discuss the two calculation methods. Are both legitimate? How could you relate the two methods? Is this related to a property of multiplication? Explain.

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There are 21 bags with 2 marbles in each bag, Ben calculates the number of marbles there are in all...