After drawing a cross-section of an ancient Greek temple, we used folded paper to strengthen sheets of paper. We looked at buildings by the British architect, Richard Rogers, who used X shapes. The reinforced shapes were fastened together, to form ceiling and a base, columns and a roof.
We played a game, where by spinning a spinner it generated a number to be subtracted from a 4 digit number. In ten moves or less, whoever reached zero - won.