8 – 8 * 8 + 8 계산법과 정답 풀이 총정리

The Internet’s Favorite Trap: Decoding $8 – 8 times 8 + 8$

If you have spent any time scrolling through social media, you have likely encountered deceptively simple math problems designed to spark heated comment wars. Expressions like $8 – 8 times 8 + 8$ look harmless enough at first glance, yet they routinely divide the internet into camps swearing by entirely different answers.

Let’s break down this viral arithmetic puzzle, look at why it trips so many people up, and find the definitive truth behind the numbers.

Step-by-Step Solution: Following the Rules

To solve any mathematical expression correctly, we rely on the universal standard for the order of operations, commonly remembered by acronyms like PEMDAS (Parentheses, Exponents, Multiplication/Division, Addition/Subtraction) or BODMAS (Brackets, Orders, Division/Multiplication, Addition/Subtraction).

Here is how the rules apply to our expression:

1. Multiplication First:
   According to the order of operations, multiplication takes precedence over addition and subtraction. We look at the middle term, $- 8 times 8$:

   • $8 times 8 = 64$
   • Substituting that back in, our expression becomes: $8 – 64 + 8$

2. Addition and Subtraction (Left to Right):
   Multiplication and division have equal priority, as do addition and subtraction. When faced with a string of same-priority operations, we always work from left to right.

   • First, perform the subtraction on the left: $8 – 64 = -56$
   • Next, perform the final addition: $-56 + 8 = -48$

The correct answer is $-48$.

Where Do People Go Wrong?

Why do millions of people get answers like $0$ or $8$ when looking at this same problem? It usually comes down to two common cognitive traps:

• The Left-to-Right Blindspot: Many readers read math sentences like regular text, sweeping straight across from left to right without prioritizing multiplication. If you calculate $8 – 8 = 0$ first, you end up with $0 times 8 + 8$, which collapses down to $8$.
• The Grouping Illusion: Others instinctively group terms visually, assuming that $8 – 8$ and $8 + 8$ can be calculated independently as $(8 – 8) times (8 + 8)$. This turns the equation into $0 times 16$, yielding a clean and satisfying $0$. Unfortunately, mathematical grammar does not support grouping numbers across multiplication symbols without explicit parentheses.

Why Order Matters

Math is often described as a universal language. Just as grammar and punctuation keep human sentences from turning into gibberish (consider the difference between “Let’s eat, grandma” and “Let’s eat grandma”), mathematical conventions like the order of operations ensure that an equation written in Seoul, New York, or Paris evaluates to the exact same value every single time.

Next time you see a viral math puzzle pop up in your feed, you’ll know exactly how to look past the illusion and spot the correct answer!