Problem 27 - Introductory Algebra for College Students

Question

Find each sum without the use of a number line. $$-3.6+2.1$$

Step-by-Step Solution

Answer

-1.5

Step 1: Identify the Sign of Each Number

The first value, -3.6, is a negative number because it has a minus sign (-) in front of it. The second value, 2.1, is a positive number since it doesn't have any sign in front of it.

Step 2: Practice Arithmetic Operation

When you add a positive number to a negative number, you essentially subtract the positive number from the negative number. So, -3.6 + 2.1 can be thought of as -3.6 - 2.1.

Step 3: Perform the subtraction

You then follow the rules of subtraction to get the result. Since you are taking 2.1 away from -3.6, the result will be more negative, specifically, -1.5.