Blockbusters game on a PowerPoint.
Two teams, boys and girls work good because of the blue and pink colours.
One team chooses a number, and you ask a question (any question you like)
If they get it right, then press the symbol of the team that got it right.
The first team to get from one end of the board to the other wins. Or the first team to get 4 or 5 blocks. You decide.