If three layers are used and each is rodded 25 times, what is total roddings?

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Multiple Choice

If three layers are used and each is rodded 25 times, what is total roddings?

Explanation:
Key idea: when you have several equal groups, total is group size times number of groups. Here, each layer is rodded 25 times, and there are three layers. So you add 25 three times or simply multiply: 25 × 3 = 75. The total roddings are 75.

Key idea: when you have several equal groups, total is group size times number of groups. Here, each layer is rodded 25 times, and there are three layers. So you add 25 three times or simply multiply: 25 × 3 = 75. The total roddings are 75.

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