Mathematical calculations are not usually a favorite hobby, but they appear among the most recommended exercises to sharpen the mind, activate logic and maintain brain fitness. It does not require a specific age and is suitable for all levels. On this occasion, we suggest solving the following process within 40 seconds: (81 – 9 x 9) + (1000 ÷ 10) = ?
At first glance, it looks like a basic school exercise, although it hides an almost imperceptible trap that causes errors even in adults who are accustomed to performing arithmetic operations by heart.
The basic rule for solving mixed mathematical operations is known as Bemdas (for its abbreviation in English) or Hierarchy of operationswhich specifies the order in which the different parts of the calculation should be solved. The arrangement is as follows:
When this hierarchy is ignored, the result may be incorrectWhich makes seemingly simple problems become mentally challenging.
If someone is unable to reach a certain result or feels doubt about his answer, he can follow this short and clear solution. The full expression is: (81 – 9 x 9) + (1000 ÷ 10) = ?
Firstly, ParenthesesAnd inside it Multiplication and division Before offering:
1. In the first bracket:
So the first block becomes: (81 – 9 x 9) = 0
2. In the second arc:
3. Both results are replaced in the original expression:
Final amount directly: 0 + 100 = 100
Final score: 100
Far from being a simple mathematical challenge, solve exercises like this It has multiple benefits for the mind. According to a study conducted by Princeton University, published in the journal Journal of NeurosciencePracticing mathematical calculations affects people’s ability to make decisions, because with each operation performed, the main areas of the brain related to logic, reasoning and memory work.
Some specific benefits to our daily cognitive performance are:
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