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Chopper Squad is an easier version of TopMarks' popular mental maths game, Helicopter Rescue. Chopper Squad similarly has different sized number grids, the largest of which is from 1 to 100. It is tablet friendly and is designed to help children with the concept of one more or less and ten more or less than a given number. Being able to find one more or less is requirement in the Year 1 National Curriculum in England.