Percentage Calculation and Mental Math Shortcuts

Flashcards covering the methods and shortcuts for calculating percentages as discussed in the lecture notes.

Calculating a percentage of a number

The process of converting a percentage to a decimal and multiplying it by the target number.

Percentage to Decimal Conversion

The act of dividing a percentage by $100$ or moving the decimal point two places to the left.

The $10\%$ method

A mental math shortcut used to find $10\%$ of any number by moving its decimal point one place to the left.

The $1\%$ method

A mental math shortcut used to find $1\%$ of any number by moving its decimal point two places to the left.

$10\%$ of $150$

A specific example of the mental math shortcut that results in the value $15$.

$1\%$ of $150$

A specific example of the mental math shortcut that results in the value $1.5$.

$20\%$ of $80$

A sample calculation that involves converting a percentage to $0.20$ and multiplying by $80$ to equal $16$.

Calculator Soup Percentage Calculator

A specific tool mentioned for performing complex percentage calculations instantly instead of using manual math.

Percentage Calculator

An online tool used to skip math and find answers to percentage problems instantly.

Mental Math Shortcuts

Methods such as the $10\%$ and $1\%$ rules used to calculate common percentages quickly in your head.