-1.8 - 3.9=
-1.8 - 3.9 = -5.7
-7+ 5=
-7 + 5 = -2
To calculate -1.8 minus 3.9, follow these steps:
Step 1: Write down the two numbers: -1.8 and 3.9.
Step 2: Subtract the second number from the first number.
-1.8 - 3.9 = -5.7.
Step 3: The result is -5.7.