Use the blank colored cards for the back of the cards if you want.
I laminate them to make them last longer.
Sort the cards by color. (You may want to print more than one set in order to get more cards.)
Place all the same colored cards in a deck and place in a ziplock bag or other card container.
These are great for students to learn to count on, and visualize numbers.This is so important for good place value understanding.
My students play many math games with these.
-War or top-it, addition top-it, double digit and triple digit top-it, and so many more.
Most math programs use math card games and mine always get mixed up. The colors help me to sort the decks too which is really nice.