What's 100-80÷2+10=? math Question answer 

Whether it’s a viral Facebook post or a throwback to middle school, math problems like this always seem to spark a debate in the comments. At first glance, it looks like a simple left-to-right calculation, but there’s a hidden "law of the land" that changes everything.

Here is the breakdown of how to solve 100 - 80 ÷ 2 + 10 without breaking a sweat.

The Golden Rule: PEMDAS (or BODMAS)

To solve this, we have to follow the Order of Operations. Depending on where you went to school, you might know it as PEMDAS or BODMAS. It’s the hierarchy that tells us which part of an equation to tackle first:

Parentheses / Brackets

Exponents / Orders

Multiplication and Division (from left to right)

Addition and Subtraction (from left to right)

Step-by-Step Solution

Let’s look at the equation again: 100 - 80 ÷ 2 + 10.

Step 1: Division First

Scanning the equation, we see subtraction, division, and addition. According to the rules, division always comes before addition or subtraction.

80 ÷ 2 = 40

Now, our equation looks like this:

100 - 40 + 10

Step 2: Addition and Subtraction (Left to Right)

Now that we are left with only subtraction and addition, we simply work our way from left to right. This is where many people get tripped up—they think addition must happen before subtraction because "A" comes before "S" in PEMDAS, but they actually hold the same "rank."

100 - 40 = 60

60 + 10 = 70

The Final Answer

The correct answer to the problem is 70.

Why do people get 20?

Usually, it’s because they solve it strictly from left to right: (100 - 80 = 20), then (20 ÷ 2 = 10), then (10 + 10 = 20). It’s a common mistake, but in the world of mathematics, the order of operations is non-negotiable!