Ratio compares one number to another using A:B format. Ratios are used in finance, photography, architecture, and engineering. Order of numbers matters in ratio relationships
Percent change shows how much a number has increased or decreased. Formula: (Original Value - New Value) / Original Value × 100. Original value is the denominator when calculating percent increase
Percentage increase is calculated by dividing increase by original amount. Example: $450 increase from $400 means 12.5% increase. Result is multiplied by 100 to get percentage
Multiply original price by discount percentage decimal. Subtract discount from original price to find sale price
Percentage means "of 100" and is a special fraction with denominator 100. Enter percentage and press % button to convert to decimal. Clear button (C/AC) must be pressed before calculations
Percentage means one part of a hundred. Percentages help visualize quantities and make comparisons. Common quantities like sales tax and interest rates are expressed in percentages