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Move beyond an answer. Explore visual reasoning puzzles and interactive challenges across all 6 subjects, with instant rule-based verification and step-by-step explanations.
What belongs in each mystery box?
Every mystery box holds the same value. Make the two sides balance.
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$700 is invested at 6% simple interest per year for 3 years. How much simple interest is earned?
Use I = Prt to calculate simple interest earned on a principal sum over a number of years.
0 of 4 solved in this round
Featured, challenges & worksheets in Time & money
Foreign currency exchange
Convert an amount in USD into a foreign currency using a given exchange rate.
Compound interest & growth
Calculate the compounded value of an investment over two annual compounding periods.
Nominal vs real interest & inflation
Use the Fisher approximation (real ≈ nominal − inflation) to find the inflation-adjusted return.