The “exchange rate circle”
When travelling abroad, you often try to use some quick calculations for currency conversions, such that you can quickly in your head find what a certain price is in your own currency. From € to my local currency, kr, I e.g. do "multiply by 7 and add a bit" or from € to £ "take somewhat more than 10% off". These calculations in your head often get imprecise, so it might be useful to have something better, maybe in your purse. For my local currency to €, having a printed copy of this: does exactly that. Lookup € on the outside and convert to kr. on the inside. If something costs €29, I see there is a marker for 2.8 on the outside, then a somewhat larger marker and the…