today's silver value of "silver strikes"

The silver content of silver dimes, quarters, and halves is proportional to their face-value, because their weights are proportional and silver represents 90% of that weight in each coin.

So a silver quarter would be worth $8.79.

Note:
A Kennedy-half from 1965 through 1969 contains only 40% silver.
Oh, . . . and silver dollars are also 90% silver, but they weigh more than 10 silver-dimes or 4 silver-quarters or 2 silver-halves; and they almost always command a slight premium over just silver content.

Here's the rule of thumb which dealers in junk-silver employ:
There are approximately 715-ounces of silver in a $1000-bag of circulated silver coins.
So, take the price-of-silver-per-ounce and multiply it by 0.715 to get the multiple applicable to a silver coin to determine its silver-value.
Example:
Silver price-per-ounce = $49.19.
49.19 X 0.715 = 35.17
A silver-dime is worth .10 X 35.17 = $3.52
A silver-quarter is worth .25 X 35.17 = $8.79
A silver-half is worth .5 X 35.17 = $17.59

[n.b.: The actual silver content of newly-minted silver coins as they came out the chute at the US Mint was 723.4 ounces in a $1000-bag. DonDiego notes the web-site cited by MoneyLA above indicates this weight. The 715 ounces estimate, . . . sometimes even 712 ounces, . . . is employed by dealers to account for the slight loss of weight of circulated coins. Of course it is also possible to simply weigh the coins to arrive at the actual silver content.]

I have 11 silver strikes from my first trip in 1995 to Vegas, guess i should sell since they don't have much value to me.

You could get a bit over $300 for them in todays market. Had you cashed them in in '95 and bought a Cd, you'd have about the same amount.

As DonDiego types, a little after 21:00 EDT Sunday, the price of silver has fallen almost $3 in Monday morning trading in Asia; a bit earlier it was down almost $6 to just above $42 ! ! !

Things happen.