Number Bonds to 20 (Plants) - Treetop Displays - With a prompting title poster, here is a set of 22 A4 posters showing the number bonds to 20. Each poster shows a number bond with a flower and leaves. Will brighten up the classroom! Visit our website for more information and for other printable classroom resources by clicking on the provided links. Designed by teachers for Early Years (EYFS), Key Stage 1 (KS1) and Key Stage 2 (KS2).