The Indian multiplication table and unit conversion chart show signs of use, as they were stuck in the bathroom. The world map and fraction posters are unused. These cannot be stuck to the bathroom wall. I personally think it's quite valuable that you can do 19x19 at a mental calculation level just by repeating it in the bath. In fact, my daughter had developed calculation skills to the point where she started learning high school math towards the end of elementary school. (Of course, this is not solely due to these posters. It's thanks to her own efforts.) It can be used simply by adults as well. You can acquire mental calculation skills that will impress people at work. The Indian method alone costs a fair amount, and if the posters are sent without folding, the shipping costs will inevitably be high, so we would appreciate your understanding. *The recorder and cushion used for support are not included in the sale.