How do you simplify 7+9times3-25 using order of operations?

2 Answers

29

Explanation:

The order of operations, sometimes known by the acronym PEMDAS (or some variant of it) is:

  • color(red)(P) - Parentheses (also known as Brackets)
  • color(blue)(E) - Exponents
  • color(green)(M) - Multiplication
  • color(green)(D) - Division (this has the same weight as M and so I gave it the same colour)
  • color(brown)(A) - Addition
  • color(brown)(S) - Subtraction - (again, same weight as A and so the same colour)

Here we have:

7color(brown)+9color(green)(xx)3color(brown)-5

The multiplication goes first:

7+27-5

and now we work this from left to right:

34-5

29

Aug 9, 2018

9

Explanation:

Identify the number of terms first.

Terms are separated by + and - signs.

Simplify each term first.

color(blue)(7" ") color(green)(+" "9xx3" ") color(magenta)(-" "25)

=color(blue)(7" ") color(green)(+" "27" ") color(magenta)(-" "25)

=" "34" "-" "25

= 9