Here's a fun froggy poster that explains how to work out whether it's a Leap year - or not.
Is it a Leap Year Poster
This "2020 is a Leap Year" display banner prints out over 3 A4 pages. Each overlaps the other a little so you will need to trip and glue or sticky-tape together to get the full length.
Playing a game is a great way to learn how Leap Years work, and to practise some maths skills at the same time. Just put your counters on the "Start" stepping stone, then roll one dice. Work out whether you have landed on a leap year or a normal year.