These Earth Day number 1-20 cards are perfect for practicing counting up to 20. There are two sets of cards that provide two levels of differentiated practice. One set of cards have the number and the tens frames are blank so students must correctly count to the number by placing manipulatives in the tens frames. The other set has the tens frames already marked with recycle signs so students who need a little extra guidance can simply over lay their counters to complete the card.