The deterministic time-value-of-money core behind the actuarial FM exam and fixed-income finance: compound interest and discount, effective vs nominal rates and the force of interest δ; level, due, deferred, varying, and perpetual annuities (aₙ, sₙ, äₙ); loan amortization and the interest/principal split, sinking funds, and equations of value; bond pricing at a premium or discount, book value and amortization; yield rates via net present value and the internal rate of return, plus spot and forward rates; and interest-rate risk through Macaulay/modified duration, convexity, and immunization.
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Every idea is taught with motivation and a worked example before the drills, and an FSRS spaced-repetition engine schedules each review for the day its model predicts you would forget it. A short placement check finds what you already know, so you start Financial Mathematics (Actuarial) exactly where it's useful.