Compare Expressions: Find the Correct Sign Between 10+5 and 10+10

To solve this problem, let's determine the values of each sum and compare them:

• Step 1: Calculate the sum of $10 + 5$.

Performing the addition, we have:

$10 + 5 = 15$

• Step 2: Calculate the sum of $10 + 10$.

Performing the addition, we have:

$10 + 10 = 20$

• Step 3: Compare the two sums: $15$ and $20$.

Since $15$ is less than $20$, the inequality between $15$ and $20$ is:

$15 < 20$

Therefore, the correct sign to insert in $10 + 5\Box10 + 10$ is:

$<$

Thus, the complete inequality is:

$10 + 5 < 10 + 10$

Therefore, the solution to the given problem is $\Box = <$.