This post has a free printable counting by 2’s with penguins. The book Penguin Pairs: Counting by 2s by Amanda Doering Tourville, and illustrated by Sharon Holm, could be used with this activity.
This book teaches counting by 2s as two additional penguins appear in each additional picture. A counting line at the bottom of each page shows what is happening in the illustrations.
I was inspired to make a freebie showing the same thing for teachers to have on hand in the classroom for quick use. This freebie shows counting to 20 by twos. Watch the number line on the bottom of the pages to see what is happening! There is one worksheet and answer key included. free-penguin-count-by-pairs
For some reason there is a 1- on the bottom of the cover and I figure out how to remove it, but the other pages are all fine.
Thank you for reading, Carolyn