Work Step by Step
The addends (numbers being added have) different signs. To add two numbers with different signs, perform the following steps: (1) Subtract the smaller absolute from the bigger absolute value. $|-3.6|-|2.1|=3.6-2.1=1.5$ (2) Use the sign of the number with the bigger absolute value. $-3.6+2.1=-1.5$ Thus, the sum is $-1.5$.