Question: A square has a perimeter of 60 cm. A rectangle has the shape of two of these squares placed side by side. what is the perimeter of this rectangle?

Predict: I thought this question would be about the four operations.

Clarify: I had nothing to clarify.

Find the big picture: What is the perimeter of the rectangle?

Solve:

First I worked out that 60 divided by 4 is 15, so the squares have 15cm edges.

Then I worked out that when they are both together, two sides won’t be part of the perimeter.

So 15+15+15+15+15+15 is 90, so the perimeter of the rectangle is 90 cm.

Summary: I used my prior knowledge.