From Psychologies · La Rédaction · · 1m
Daily Challenge: Can You Solve It in 20 Seconds?
A quick mental math challenge tests your ability to follow order of operations without rushing.
In brief
A quick mental math challenge tests your ability to follow order of operations without rushing. Solving 84×2-(56÷7+9) in 20 seconds requires careful attention to parentheses and operations, not advanced math skills. Originally reported by Psychologies.
Quick answers
- Daily Challenge: Solve in 20 Seconds?
- The challenge asks you to solve a mental math problem in 20 seconds without a calculator.
- What is the key takeaway from Daily Challenge: Can You Solve It in 20 Seconds??
- Solving 84×2-(56÷7+9) in 20 seconds requires careful attention to parentheses and operations, not advanced math skills.
Daily Challenge: Solve in 20 Seconds?
The challenge asks you to solve a mental math problem in 20 seconds without a calculator.
“84 × 2 - (56 ÷ 7 + 9)”
Why This Challenge Is Tricky
The problem uses familiar numbers and operations but requires careful attention to parentheses and order.
“Parentheses change the calculation rhythm completely.”
Common Mistakes in This Challenge
People often skip parentheses or rush through operations, leading to incorrect answers.
“The brain loves shortcuts but can be tricked by parentheses.”
How to Solve Correctly
First solve inside parentheses: 56 ÷ 7 = 8, then 8 + 9 = 17. Next multiply 84 × 2 = 168. Finally subtract 17 from 168.
“84 × 2 - (56 ÷ 7 + 9) = 151”
The Real Test
This challenge measures your ability to slow down and follow operations, not advanced math skills.
“The answer is 151, but the real test is attention to detail.”
The main idea
Solving 84×2-(56÷7+9) in 20 seconds requires careful attention to parentheses and operations, not advanced math skills.
