Pick a theme
Pick a category from the board.
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One method, laddered. Find 10%, then build the rest from it: 5% is half of it, 20% is double, 15% is 10% plus half again. From there, 25% off an $80 game, what percent 12 out of 48 is, and the ones most adults get wrong.
A $100 coat at 40% off and then another 20% off at the checkout costs $48, not $40 — the second discount comes off the already-reduced price. Up 10% then down 10% does not return you to where you started. Sales tax goes on the sale price, not the original. Buy three get one free is 25% off, not 33%. If it has been a while since you worked any of this out from scratch, this is the easiest place to get it back.
Coro — chorus. Everyone gets to play.