Have you ever come across a math problem that seems easy at first glance, only to realize that most people get it wrong? The equation 9 – 9 ÷ 9 + 9 – 9 ÷ 9 = ? is one such puzzle that confuses many. It looks simple, but if you’re not careful, you might end up with the wrong answer.
Are you ready to put your math skills to the test? Take a moment to solve it before reading ahead. Think you got it right? Let’s find out!
Why Do So Many People Get This Wrong?
At first glance, this equation appears straightforward. However, small details in mathematical rules trip people up. Here are some common mistakes that lead to the wrong answer:
- Ignoring the Order of Operations (PEMDAS/BODMAS) – Many people solve the problem from left to right without following the correct order of operations.
- Misplacing Parentheses (Even When They Aren’t Written) – Some assume parentheses where there are none, changing how they approach division and subtraction.
- Rushing Through the Calculation – The problem is designed to look easy, so people tend to solve it quickly and overlook critical steps.
So, what’s the correct approach? Let’s break it down step by step.
Step-by-Step Solution
To solve this equation correctly, we must follow the order of operations. The most commonly used rule is PEMDAS (Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right)).
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The given equation:
9 – 9 ÷ 9 + 9 – 9 ÷ 9
Step 1: Solve the Division First
According to PEMDAS, division comes before subtraction and addition. So, let’s divide first:
- 9÷9=19 ÷ 9 = 19÷9=1
- 9÷9=19 ÷ 9 = 19÷9=1
Now, substitute these values back into the equation:
9 – 1 + 9 – 1
Step 2: Perform Addition and Subtraction from Left to Right
Now, we calculate in order from left to right:
- 9 – 1 = 8
- 8 + 9 = 17
- 17 – 1 = 16
So, the correct answer is: 16
Common Incorrect Answers and Why They Happen
Many people arrive at incorrect answers because they don’t follow the correct order of operations. Here are some of the most common mistakes:
- Answer: 0 – This happens when someone groups all the numbers together without following PEMDAS, incorrectly simplifying the problem as:
9−9−9+9−9=09 – 9 – 9 + 9 – 9 = 09−9−9+9−9=0 - Answer: 1 – Some mistakenly subtract 9 from itself first before dividing, leading to:
(9−9)÷9+9−9÷9=1(9 – 9) ÷ 9 + 9 – 9 ÷ 9 = 1(9−9)÷9+9−9÷9=1
These errors reinforce the importance of following the correct mathematical rules step by step.
Why Understanding Order of Operations Matters
You might wonder—why does it even matter? Well, mathematics is built on logical rules, and following them correctly ensures we get consistent, accurate answers. The order of operations is used in everything from programming to engineering to everyday calculations.
Video : Only 1% of people pass this logic test
Think about it this way: If a recipe tells you to bake a cake at 350°F for 30 minutes before adding frosting, you wouldn’t reverse the steps, right? Math works the same way—sequence matters!
Put Your Skills to the Test
Did you get the correct answer? Share your response in the comments! Were you surprised by how easy it was to make a mistake?
If you enjoy solving puzzles like this, challenge your friends and see if they can get it right! Math riddles help improve problem-solving skills and boost logical thinking.
Want more brain teasers like this? Keep testing yourself with tricky puzzles and improve your critical thinking skills! Who knows? The next time you see a math problem like this, you might be among the 10% who get it right on the first try!
Son donates hair to his mom who has been battling a recurrent brain tumor for nearly 20 years
What was intended to be a joke ended up being one of the greatest gifts a mother could ever have from her son.
An Arizona guy grew out his hair for over three years in order to give it to his mother, who lost her hair due to radiation treatment.
Matt Shaha declared, “It makes perfect sense.” “In the first place, she gave me the hair.”
Melanie Shaha battled a benign brain tumor for many years.
She remarked, “I had surgery twice, in 2003 and 2006, for a pituitary tumor that was recurrent and benign brain tumor.”
After two successful surgeries to remove it, she was prescribed radiation in 2017 when it reappeared.
“I inquired with my doctor, ‘Will my hair fall out?’” and they replied, “No.”
She lost her hair three months later.
A TWO-DAY WEEK…
She remarked today, “When you don’t have hair, you stand out like a sore thumb and kind people can say things that make you cry.” “Looking sick bothers me more than actually being sick.” At the store, I’d want to fit in rather than stand out.
Shortly after Melanie started experiencing hair loss, her son, who is 27 years old, made a joke one day about growing his hair out and getting a wig for her.
I began working with Matt Shaha a year ago, and he is one of the most giving people I have ever met. Among the original…
Even though Melanie’s son was receiving such a nice offer, she didn’t want to burden him with it.
But Matt had a different perspective. For the next 2.5 years, he let his hair grow out. He went to his mother’s house with a few coworkers when his hair was at the right length, and they chopped it off.
I began working with Matt Shaha a year ago, and he is one of the most giving people I have ever met. Among the original…
Melanie remarked, “We were so excited that we started crying when they started cutting.”
He even paid the $2,000 to have the wig created when the time came.
The mother and son team discovered a wigmaker who created a lighter and more comfortable wig by hand-stitting the hair. Melanie had the wig trimmed and styled as soon as it arrived.
“It’s the first time I’ve seen my mom look like that since she lost it, so it’s been about four years,” Matt remarked upon seeing her in it.
Melanie, smitten with her new appearance, conceded that surpassing her son’s present would be difficult. “It definitely fills your heart.”
Melanie is very happy! Look at her expression! Matt is even grinning broadly. For them both and their families, I adore this.
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