Keywords: Starter | Investigations | Number Patterns | Problem Solving

• Mr Martin Magic Maths Set, Dulwich College Beijing
• Tuesday, November 23, 2010
• "My Y5 class found this very challenging but it really got them thinking. In the end we found the solution!"
• Mr J Saye, Castle Rock High School
• Monday, November 14, 2011
• "
  Katie S in my Year 8 Set 1 class found that if you do the multiplication for one less than how many there are in the group and half it you get the correct answer,
  eg. For a class of 20 19 x 20 = 380 / 2 = 190
  this is becasue the multiplication shows everyone shaking others' hands and them shaking back which would be a double hand shake which is why you half the answer."

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