Concepts in Focus
A Currency Conversion Needs a Direction Before a Multiplication
Use an invented exchange-rate example to distinguish units per currency and avoid applying the same multiplication in both directions.
Financial ideas, carefully read
Concepts in Focus
Plain-language explanations of financial ideas, with room for assumptions, limitations and further reading.
Concepts in Focus
A Loan Payment Is Not All a Reduction of Principal
Read a loan example by separating the amount paid from the amount applied to principal, and keep fees and other components visible.
Concepts in Focus
APY and the Interest Rate Are Labels Worth Keeping Apart
Annual percentage yield reflects compounding in a way a stated interest rate may not. Read the labels and assumptions before treating two percentages as equivalent.
Concepts in Focus
Net Worth Is a Snapshot; Income Describes a Period
A balance sheet and an income figure answer different questions. Follow a small worked example that keeps assets, liabilities and the measurement date visible.
Concepts in Focus
Read a Financial Chart’s Currency Before Comparing Amounts
Check currency, conversion dates, and the meaning of displayed amounts before comparing two financial examples or charts.
Concepts in Focus
A Price per Month Can Hide a Different Commitment
Compare an illustrative monthly payment with its full stated term, while checking upfront charges and conditions before treating two offers as equivalent.
Concepts in Focus
When Two Pricing Formulas Meet at the Same Total
Work through two fictional pricing formulas to see why a fixed charge and a per-item charge can produce different comparisons at different quantities.
Concepts in Focus
Gross Pay and Take-Home Pay Belong on Different Lines
Read gross and net pay as different stages of a pay statement, and use a simple example to check the arithmetic without assuming particular tax rates.