I would print the cards representing units in a particular period the same color. More Place Value Ideas - FREE printable - Example on extending learning beyond an ipad game with the use of FREE printable resource

Teach place value, numbers, decimals, and greater than/less than with these hands on elementary math activities! Use printables, manipulatives, and more!

Free Printable Fractions Worksheets: from the variety of worksheets provided, these worksheets can be very useful when dealing with different sized fractions and how they relate to each other.