Make counting various combinations of coins and dollar bills simple for students of all ages and abilities by encouraging them to experiment with different coin and bill combinations. Students use their fingers to slide the realistic coins and bills from left to right. When each coin or bill reaches the right side, the Coin Abacus displays the new total on the easy-to-read LCD screen on the right. When a coin or bill is moved back to the left, the amount is subtracted from the total. Students see how different coin combinations can equal the same amount of money.