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  2. Coin rolling scams - Wikipedia

    en.wikipedia.org/wiki/Coin_rolling_scams

    Pennies from pre-2010 and nickels minted between 1982 and 2000 are very common because their composition is similar to American coins, so coin counting machines can't tell the difference. Various currencies, including the 500 Italian Lira coin, the 5 South African Rand coin, and the 10 Thai baht coin, are similar to the 2 Euro coin and are ...

  3. Kumon - Wikipedia

    en.wikipedia.org/wiki/Kumon

    All Kumon programs are pencil-and-worksheet-based, with a digital program that started in 2023. The worksheets increase in difficulty in small increments. [9] [10] Psychologist Kathy Hirsh-Pasek says that using such techniques for 2 to 12-year-olds "does not give your child a leg up on anything". [7] One study has observed a high percentage of ...

  4. £sd - Wikipedia

    en.wikipedia.org/wiki/£SD

    A sampler in the Guildhall Museum of Rochester illustrates the conversion between pence and shillings and shillings and pounds. Old till in Ireland, with "shortcut" keys in various £sd denominations (lower numbers) and their "new pence" equivalent (upper numbers) Toy coin, which teaches children the value of a shilling

  5. Penny (United States coin) - Wikipedia

    en.wikipedia.org/wiki/Penny_(United_States_coin)

    The penny, also known as the cent, is a coin in the United States representing one-hundredth of a dollar.It has been the lowest face-value physical unit of U.S. currency since the abolition of the half-cent in 1857 (the abstract mill, which has never been minted, equal to a tenth of a cent, continues to see limited use in the fields of taxation and finance).

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  7. Change-making problem - Wikipedia

    en.wikipedia.org/wiki/Change-making_problem

    The following is a dynamic programming implementation (with Python 3) which uses a matrix to keep track of the optimal solutions to sub-problems, and returns the minimum number of coins, or "Infinity" if there is no way to make change with the coins given. A second matrix may be used to obtain the set of coins for the optimal solution.