Doubles Facts to 20 Posters This product includes a set of 11 bright and colourful butterfly posters which contain double addition facts to 20. On each poster the corresponding number of dots is displayed on the wings of the butterfly to match the double addition fact below. These posters can either be displayed as digital slides on a large interactive TV screen or printed out and hung up in the classroom. To construct the posters print out all pages onto white paper or cardstock and laminate for durability. Select printing option “fit to page”.