Primary challenges (ages 5-11)

Typically completed by 5-11 year olds (Key Stages 1 and 2), CREST Star and SuperStar challenges relate to everyday experiences.

The activities are designed to be easy-to-run and low-cost, and you don’t need to be a teacher, have a science background or have access to specialist equipment to run them. Children are eligible for a CREST Award after completing eight of the challenges and you’ll find helpful hints and tips in each pack for you to use, explaining the scientific themes and offering guidance on conversation topics for your children.

There are many more CREST resources which have been developed by our partners and by providers in your region. Click here for links to CREST accredited resources developed by partner organisations, CREST accredited schemes and education providers who can deliver CREST accredited activities.

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6 months ago

All Star challenges

  • Text
  • Cosmic
  • Materials
  • Association
  • Registered
  • Stella
  • Plants
  • Encourage
  • Astro
  • Timers
  • Rainbow


MUDDY MESS MUDDY MESS Muddy Mess Activity Card Gem and Cosmic are very excited. Today is the day of the school party. They set off really early, dressed in their party clothes. It has been raining for days, but now, HOORAY, the sun has come out. What a wonderful day for a party! Gem is so keen to get to the party that she skips on ahead. “Wait for me!” Cosmic shouts. But Gem doesn’t hear him, she is too busy dancing along in the sunshine. Suddenly, SPLAT, Gem trips and falls into a muddy puddle. Oh no! Her lovely new T-shirt is covered with mud. What can she do? Luckily MUDDY they are MESS very close to Aunt Stella’s house, so they knock on her door. “Oh dear,” says Aunt Stella, as she opens the door. “What a muddy mess!” “Can you get me clean again for the party?” Gem asks in a sad, little voice. “I am sure there is something we can do,” says Aunt Stella kindly. “We just need to think about it.” Gem thinks the mud will brush off when it’s dry Cosmic thinks we might need soap and water Aunt Stella thinks it will soon rinse out with some cold water Have you ever got your clothes really dirty? How did you get them clean?

Your challenge Find out the best way to get muddy clothes clean. Discuss Talk to your buddy about how to find out the best way to get clothes clean again. What do you think? Getting started Put some mud onto 3 pieces of fabric. Use the same fabric and the same amount of mud. Wash 1 piece in cold water, 1 in water with soap, and leave 1 to dry then brush the mud off. Does the water or soap get the mud off? Was your test fair? What do you think would happen if you use warm water or different soap? . MUDDY MESS MUDDY MESS Test your ideas DY MESS Can you think of other ways to try to get the mud out? Share your ideas You could put your materials on the winners’ podium. Put the one that is the cleanest on the top. Or you could make a poster about how to get dirty clothes clean. Extra things to do Try different stains e.g. tomato sauce, fruit juice. Don’t get them on your own clothes! Find out if all washing powders are as good as each other at getting things clean. British Science Association Registered Charity No. 212479 and SC039236

Star level

Collections of 1 hour challenges recommended for children aged 5-7 years that relate to children’s everyday experiences. Find out more about this level and how to gain a CREST Award on the Star page

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SuperStar level

Collections of 1 hour challenges recommended for children aged 7-11 years that realate to broader situations that children are likely to have come across. Find out more about this level and how to gain a CREST Award on the SuperStar page

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Getting Started Guide: Primary
All SuperStar challenges