Understanding Percentages and Basic Calculations
This section introduces the fundamental concepts of Cálculo de porcentajes en problemas matemáticos and their practical applications. The content focuses on how to calculate percentages using direct proportion and mental math techniques.
Definition: A percentage represents a fraction with a denominator of 100, expressing parts per hundred.
Example: To calculate 30% of 250, use direct proportion: (30 × 250) ÷ 100 = 75
Highlight: Mental calculations are emphasized for common percentages like 20%, 15%, and 10% of values like 200 and 50.
The page includes practical business examples, such as calculating employee distributions in cleaning companies, demonstrating real-world applications of percentage calculations.
Example: In a cleaning company with 180 employees, 95% work night shift. The calculation shows: (180 × 95) ÷ 100 = 171 employees.
Vocabulary: Direct proportion (Regla de tres directa) - A mathematical method used to solve percentage problems by establishing proportional relationships.