47 + (-8) + (-20) = ?

When adding a positive integer with a negative integer it is the same thing as subtracting them.  For example:  8 + (-6) = is rewritten as 8 - 6 = 2. To show that an integer is a negative number in a math problem it is surrounded by parentheses. When subtracting negative integers it is the same thing as adding them.  For example 10 - (-5) = is rewritten as 10 + 5 = 15. When adding a negative integer with another negative integer it is the same as adding positive integers.  For example: (-30) + (-20) = 30 + 20 = 50.  The minus symbol “-” is then placed before the answer so the answer is... Show more

When adding a positive integer with a negative integer it is the same thing as subtracting them.  For example:  8 + (-6) = is rewritten as 8 - 6 = 2.

To show that an integer is a negative number in a math problem it is surrounded by parentheses.
When subtracting negative integers it is the same thing as adding them.  For example 10 - (-5) = is rewritten as 10 + 5 = 15.

When adding a negative integer with another negative integer it is the same as adding positive integers.  For example: (-30) + (-20) = 30 + 20 = 50.  The minus symbol “-” is then placed before the answer so the answer is -50.

Tip:
Two like signs become a positive (“-” “-” = “+”)
Two unlike signs become a negative (“-” “+” = “-” and “+” “-” = “-”)

Show less