Austin is having trouble interpreting the plans for his Soap Box
Derby car. The plans use scale drawings and he's having trouble
understanding how items on the drawing relate to the actual car. Bridget can't help so they go next door to ask Alex. He shows them
a collectors model of a Soap Box Derby car and compares it to the
one in his garage. By comparing the two, he explains proportion.
He pulls out his plans and Austin measures the axle on the car and
the plans. Using these two measurements they figure out the proportions
of the plans.
the Teacher Guide (PDF file) Lesson begins on page 23.
Activities for Ratio and Proportion