Understand prices, rates and everyday financial calculations through worked examples.
How to calculate price per square meter
Divide property prices across equal squares of area, compare two examples, and multiply back to verify the result.
How to calculate pay from hours worked
Turn hours and minutes into decimal hours, calculate gross pay, subtract unpaid breaks, and handle a separately specified overtime rate.
How to calculate and compare price per gram
Compare packages fairly by dividing total price by net mass. Animated packages and equal-mass comparisons distinguish dollars per gram from cents per gram.
How to calculate and compare price per kilogram
Convert package mass to kilograms, calculate unit price, and compare different package sizes on an equal-mass basis.
How to calculate simple daily interest
Turn an annual rate into a daily amount, accumulate simple interest without early rounding, and distinguish day-count conventions from compounding.
How to convert price per kilogram to price per pound
Convert a kilogram unit price to a pound unit price using the exact mass relationship, then check a package total and compare equivalent offers.
How to divide money into equal shares
Divide a total into equal shares, handle a repeating decimal at cent precision, and check that rounded allocations still sum to the original money.
How to convert price per pound to price per kilogram
Convert a pound unit price to a kilogram unit price, understand why the number increases, and compare or check a package total without early rounding.
How to calculate price per 100 grams
Normalize different package sizes to an equal 100-gram basis, compare the unit prices, and check how net weight and waste affect the decision.
How to convert minutes into money at an hourly rate
Convert an hourly rate to a per-minute amount, price a 25-minute interval, reverse-check the result, and scale the same method to a small meeting.
How to calculate money per second from annual income
Convert annual income into an average dollar or cent rate per second. A $72,000 example compares all 365 days with a 40-hour, 50-week working schedule, showing how the chosen denominator changes the result.
How to calculate growth rate and CAGR
Distinguish total percentage growth from a compounded rate per period. Follow a 1,000-to-1,500 example over five years, check CAGR backward, and see why simple averages and reversed changes differ.
How to calculate loan payments and total interest
Calculate a fixed-rate loan payment, follow the changing interest and principal split, and compare monthly payments with lifetime interest using a complete $20,000 example.