How do you simplify #125-43+13# using PEMDAS?

Question

1765 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2016-03-21T16:20:16

95

According to PEMDAS you will first add values so
#-43+13=-30#
then subtract
#125-30=95#

Answer 2 · 2016-08-02T21:24:57

#95#

Adding and subtracting with positive and negative values often leads to confusion.

Note that a sign in front of a number applies ONLY to that number.

So #18 - 7 + 5# does NOT mean the same as #18 - (7+5)#
The answers for these are #16 and 6#

The easiest way to avoid confusion is to re-arrange the numbers we are allowed to do (which according to the commutative law).

Place the additions at the front of the expression and the subtractions at the end.

#125 -43 +13# is better understood as:

#125+13 -43#

=#95#