This popular coin-counting calculator, developed by a special education teacher uses realistic coin buttons (penny, nickel, dime, and quarter) and a dollar bill button instead of the number buttons on regular calculators. When these buttons are pushed they add their money value to the amount on the LCD screen. The Coin-U-Lator can be used to count money and teach coin values. A simple switch changes the operation from addition to subtraction. And there's more!