3. \( -5-10= \)

To solve \( -5 - 10 \), you can think of it as starting at -5 on a number line and then moving 10 units to the left. Since -5 is already a negative number, going further left means you're going deeper into the negatives. The result is -15, so \( -5 - 10 = -15 \). When subtracting a larger number from a smaller number, it's easy to slip up and forget the rules of negative numbers. A common mistake is to get confused and think that because the numbers are negative, the output will somehow be less negative! Just remember to visualize it on the number line or think of it as adding negatives. So, stick with -5 to -15, and you’ll nail it every time!