In order to stimulate the development of multiple solutions in one condition and to prevent
their construction in the other condition, two similar versions of six tasks about Pythagoras’
theorem were developed. The topic of Pythagoras’ theorem had already been taught using
intra-mathematical tasks before the applied teaching unit. In the multiple-solution condition,
students have to find two different solutions for four of six problems and to record their
solutions. For example, in the sample problem BFire-brigade, the modification was BFind two
possible solutions. Write down both solution methods.