One day at the farm  -  Eric the Sheep
A problem solving activity

Itís a hot summer day, and Eric the Sheep is at the end of a line of sheep waiting to be shorn. There are 50 sheep in front of him. Being an impatient sort of sheep, though, every time the shearer takes a sheep from the front of the line to be shorn, Eric sneaks up 2 places in line.

Without working out the entire problem, predict how many sheep will get shorn before Eric.


[Introduction] [Smaller Version] [modelling the problem] [Strategies] [New Rules] [Extension] [Reflection]

Adapted from Algebraic Thinking, Part B: Reasoning about situations by Annenberg / CPB (2004) and originally found in  Maths 300