Solve the Expression: 7+21÷7×4+3-9 Using Order of Operations

Question

$7+21:7\times4+3-9=$

00:00 Multiplication and division come before addition and subtraction, so we'll start with them

00:10 When there are multiple operations at the same level, we solve from left to right

00:20 Let's continue with the remaining multiplication operation

00:31 We're left with only addition and subtraction operations

00:34 Addition and subtraction are at the same level, so we solve from left to right

00:51 And that's the solution!

According to the rules of the order of arithmetic operations, we must first place the multiplication and division exercises inside of parentheses:

$7+(21:7\times4)+3-9=$

We then proceed to solve the exercise inside of the parentheses from left to right:

$21:7=3$

$3\times4=12$

Which results in the following exercise:

$7+12+3-9=$

We then finish by solving the exercise from left to right:

$7+12=19$

$19+3=22$

$22-9=13$