Here is a great activity for practicing 1:1 correspondence! Kids have so much fun using their thumbprints or putting stickers on the tree. Pages are half sized and in black and white for easy printing. Each page has a blank tree and a sentence that says, "I see __leaf/leaves on the tree." My students are quite low, so we only did #'s 1-5.
This is great practice for toddlers', Pre-K, Kinders or remedial 1st!