How much are my 1964 silver quartes worth

1964 quarters contain 6.25 grams of 90% silver. There are 31.10348 grams of precious metals in an ounce so they have approximately, .3617 of an ounce of pure silver if they are uncirculated. If circulated the weight may go down. Typically dealers discount the silver by 85 cents an ounce. As such, if silver is trading for $17.00 an ounce, and you deduct $.85, a dealer will probably pay more than $2.92 for your quarter. Remember they have overhead and need to make a profit to keep their doors open.

Depends on quality and rarity of them,such as,untouched,the mint letter,quantity made..

I don't know...u can check on line...the only thing is that if u check different sites all give you different prices...