The Duchess of Cambridge has her arm wrapped in a sling Organisers said the theme of the activities at the party was looking after yourself and others physically and emotionally.Alex Peace-Gadsby, the Scout Association’s Chief Commissioner for England, said: “We’re thrilled that the Duchess has been able to join us as we celebrate the Cubs’ 100th birthday.”We have hundreds of events planned across the United Kingdom, with a chance for each and every one of our 150,000 Cubs to take part.” The Cub Scouts played a game with a ball and a multi-coloured parachuteCredit:Kensington Palace The Duchess of Cambridge joined a group of Cub Scouts near her home for a celebration to mark a century of the youth movement.She wore a yellow Cub scarf as she took part in a series of games in a bunting-decked Scout Hut, in North Wootton, near King’s Lynn, less than ten miles from Anmer Hall, where she lives with the Duke of Cambridge and their two children. A Cub Scout uses a neckerchief to show the Duchess of Cambridge how to support a broken arm Credit: Ben Stansall/PA The Duchess joked that hers would be a “short list”, before writing: “I am good at… Bonfire Building.”She paired her Cubs 100 scarf with a cashmere jumper from Iris and Ink, Zara jeans and suede Really Wild boots.She helped to decorate birthday cupcakes with icing, took part in a trust game where the children leaned back and held each other up, and had a sling put on her arm to practise first aid. The Duchess of Cambridge joined in the games at a Scout Hut near her home in NorfolkCredit:Martyn Milner Hazel Coley, the Cub Scout leader who showed the Duchess around, said: “Meeting the Duchess has been the best birthday present this Cub Scout Pack could have possibly imagined. “It’s an evening that they will never forget, and the most exciting thing that has happened to me in all my time as a volunteer. “The Duchess helped our Cub Scouts learn valuable skills for life and in reality that’s what Scouting is all about, adults and young people alike having fun, enjoying new adventures and learning new skills. “As a volunteer, you get to see first-hand how the Scouts can change the lives of young people in your community. That’s why I would recommend volunteering with the Scouts to anyone.” Show more Youngsters were asked to write something positive about what they do best on a piece of card Credit:AFP / Getty /Ben Stansall Cub Scouting was co-founded by Robert Baden-Powell and Vera Barclay in December 1916.More than half a million people are involved in Scouting across the UK, including almost 160,000 Cub Scouts.The official birthday of the Cub Scouts is on December 16, when thousands of Cubs across the country will be renewing their Cub Scout Promise. Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings. After the Cubs thanked her, the Duchess said: “It’s been a real treat for me as well to come to see all of you here and keep up the hard work because you’re doing all the hard work helping other people, helping each other and things so keep it up, and happy Christmas to you all.”She was then presented with a bouquet of flowers, and gifts for George and Charlotte – a teddy bear in a Cub Scout outfit and one in a Beaver outfit.The Duchess previously worked as a volunteer with a Cub Scout pack when she and the Duke of Cambridge lived in Anglesey, North Wales. One of the games saw a ball placed on a multi-coloured parachute. The Duchess smiled as the group used teamwork to manoeuvre it around.In another activity youngsters were asked to write something positive about what they do best on a piece of card to be displayed, to promote emotional wellbeing and resilience. The Duchess of Cambridge said it had been a ‘real treat’ to visit the Cub ScoutsCredit:Karwai Tang Afterwards she thanked the young Cub Scout who put her sling on and exchanged a high-five with him.There was a special rendition of “happy birthday dear Cub Scouts” before the group renewed their Cub Scout Promise and 100 candles were lit.The group of cubs, all from the King’s Lynn area of Norfolk, met the Duchess at a Scout Hut on Wednesday.