This activity investigates how you might make squares and pentominoes from Polydron.
Make a cube out of straws and have a go at this practical
How can you put five cereal packets together to make different
shapes if you must put them face-to-face?
Maja (Eastwood Primary School) noticed
Maja is right, and because the square gets
wider by $1$ unit each time, it also has to get taller by $1$ line
so an extra rod is added to the centre each time. Continuing the
pattern then, the next square will have $5$ yellow rods in the
centre, surrounded by green rods. After that we will need $6$ green
rods in the centre, surrounded by black rods. And so on.