First thing is, no US coin made for circulation is solid silver, all are 90% silver and 10% copper. The collectible value of any coin depends on the grade, date and mintmark. Post new question with more information.
It is worth $5-6 in silver scrap. It is 90% silver.
It is a common date worth about $5 in silver scrap.
About $6 or so in scrap silver. It is 90% silver and it is a common date.
About $5.50 for scrap silver. It is a common coin worth no more than bullion content.
The 1970 Washington quarter was NOT struck in silver.
The value is only for the silver about $3.25
The current melt value of a 1964 Washington quarter is about $5.50 (as of 11 January 2013).
It's a common date Washington quarter, most are only valued for the silver, about $5.00 as of today.
A 1942 Washington quarter is common. If it has any wear, the value is just for the silver, about $3.50.
About $2.20ish in silver scrap. They are common and only worth silver scrap regardless of condition.
1964 is the most common silver Washington quarter, it's worth about $3.00
Its worth about $5 in scrap silver. It is 40% silver and only worth scrap silver.