each box is the sum of the two boxes beneath it
which boxes can you put each of the six expressions into to form an addition pyramid?
students could make up their own expressions pyramid
cut up the six pieces and give it to their neighbour to make into a pyramid
[suggested in a session on algebra with Pat Perks and Steph Prestage, then at Birmingham University]
find as wide a range of expressions as you can that result in a top number of 5
(e.g. with 2 + 3g , 1 - g , 1 - g on the bottom row)