Daily Lego Maths: Day 30

Here is a rectangle made from squares.
What do you notice? What do you wonder?

Squares made from Lego, fitted together to make a rectangle. In the middle are a blue and yellow 1 by 1 square, then a 2 by 2 red square alongside, and continuing outward a yellow 3 by 3, white 5 by 5, blue 8 by 8, white 13 by 13 and blue 21 by 21 squares.

What are the dimensions of each square?
The shape was built outwards, starting with the smallest squares. What dimensions of square would we need to add next? Where would we add it?

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