Have you ever come across a simple math problem on social media that makes everyone debate in the comments?
Today, let’s look at a very famous viral handwritten math puzzle.
The puzzle shows a simple expression: 90 ÷ 10 + 7 × 2.
At first glance, it looks like a basic math problem from elementary school.
However, the note above the equation boldly claims: “Answer is NOT 18!”.
Is that statement actually true, or is it just a clever trick to confuse us?
Let’s break down the logic step by step using the standard rules of mathematics.
In mathematics, there is a fundamental rule called the order of operations, often remembered as PEMDAS or BODMAS.
This rule tells us which operation to perform first when solving an equation.
According to this rule, multiplication and division must always be done before addition and subtraction.
When we have both multiplication and division in the same expression, we simply solve them from left to right.
Let’s apply this rule directly to our math puzzle.
First, look at the division part: 90 ÷ 10.
When you divide 90
by 10, you get 9.
Next, look at the multiplication part: 7 × 2.
When you multiply 7 by 2, you get 14.
Now, let’s substitute these two results back into our original equation.
The equation becomes a very simple addition: 9 + 14.
Finally, we add these two numbers together: 9 + 14 equals 23.
So, the mathematically correct answer to the equation is 23.
Now, let’s address the statement in the picture: “Answer is NOT 18!”.
Why would someone think the answer is 18 in the first place?
If you make
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