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Ellen has 15 marbles, and Carlos has 12 marbles. They put their marbles together. The letter $m$ stands for the total number of marbles. We need to find the equation that can be used to find $m$.

ArithmeticAdditionWord Problem
2025/3/6

1. Problem Description

Ellen has 15 marbles, and Carlos has 12 marbles. They put their marbles together. The letter mm stands for the total number of marbles. We need to find the equation that can be used to find mm.

2. Solution Steps

Since Ellen and Carlos are putting their marbles together, we need to add the number of marbles each person has to find the total number of marbles. Ellen has 15 marbles, and Carlos has 12 marbles. Therefore, we need to add 15 and 12 to find mm.
The correct equation is:
15+12=m15 + 12 = m

3. Final Answer

15+12=m15 + 12 = m

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