Solve the Expression: Finding the Equivalent Form of 31-15

To solve this problem, we aim to find an expression equivalent to the given $31 - 15$.

Let's consider breaking down the number 31 as $30 + 1$. Thus, we can rewrite the subtraction expression:

• Step 1: Start with the original expression: $31 - 15$.
• Step 2: Rewrite 31 as $30 + 1$, so the expression becomes $(30 + 1) - 15$.
• Step 3: Apply the subtraction to both terms: $30 - 15 + 1$.

Thus, the equivalent expression is $30 - 15 + 1$.

We confirm that this results in the same value as $31 - 15$ as both simplify to 16.

Therefore, the correct expression equivalent to $31-15$ is $30 - 15 + 1$.