Mathematical Tip Intuition
To be able to calculate mathematical tips without a calculator
Power/Ability: To calculate proper math tips on a bill faster
To be able to memorize and calculate mathematical tips faster without a calculator or a pen/pencil and paper to analyze money and want to know what it is worth.
To calculate 10% of all bills, to move the decimal to the left one place without a calculator or a pen/pencil and paper. Round to the nearest full number. Example ($12.13 becomes $1.21 the tip is $2.00)