Calculation Guides With Worked Examples

Learn percentages, averages, electrical energy, perimeter, work hours and resistor circuits with checkable worked examples.

How to Calculate Percentages: Formula & Worked Examples

Learn percent of a number, part-to-whole percent, increases and discounts with verified worked examples.

Find the mean and median for even and odd datasets and see how outliers change the average.

Understand kW versus kWh: multiply power by hours, convert watts to kW and estimate usage and cost.

Find square perimeter from side length, area or diagonal using P = 4s and verified worked examples.

Calculate time between clock times, crossing midnight, unpaid breaks and decimal hours with examples.

Find equivalent resistance for series and parallel circuits with examples and the two-resistor shortcut.