David has been LOVING math. He loves to add things, figure out how things work and then tell his sisters about them. At school he has been learning about "function machines". Where on the paper it looks like you put a number in the top of a funnel and then it is added to a rule and you have to figure out the number. David decided to create his own.
Put in an 2
Put in an 2
the machine is +10
out comes 12. 
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