SCHOOLCHILDREN released balloons to celebrate the end of a maths week at a school in Harrow.
Pupils at Heathland School, in Eastcote Lane, released the balloons on Friday with mathematical problems on them.
Headteacher Chris Spruce said: "All the children have written maths problems from the nursery class up to Year Six, with the older ones producing questions on algorithms.
"We've released 350 balloons and hope that people find them and send the problems back to us.
"We have had a whole week focusing on the subject and each year had its own particular focus."
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