I'm going to give you the value of the silver in these coins, based on the current market price of $29.50 per Troy ounce. A dealer would probably offer 75% of these prices. As collector coins, I can't state a value without knowing the specific grade of each individual coin, as this is the primary factor in determining value of numismatic, or collector coins.
The first is 1959 5 pesos, with .4178 Troy ounces of pure silver - or, as the coin says, 18.055 grams of silver with 72% purity. Market price of the silver alone, $12.33
2nd - 1951 5 pesos, .643 OzT pure silver, 27.7 grams of 72%, price $18.97
3rd - 1947 5 pesos, .868 OzT pure silver, 30 grams of 90%, price $25.60
4th. - This is a 8 reales coin from the late 1800s, you've mistyped the date and other info, these were produced at several different Mexican mints, with some being worth more than others. This was known as the 'Cap and Rays' coin.
The 8 reales denomination was also known as the 'Spanish dollar' - the term 'pieces of eight' was derived from the practice of cutting these coins into 'bits' of eight pieces, and is also where the 'two bits equals a quarter' comes from. It dates back to the middle of the 16th century in Mexico. The composition of yours, .7859 grams of pure silver, and a coin that is 90% silver, went basically unchanged from 1772 to 1914. By 1914, though, the 8 reales had been gone for close to 20 years. Pesos were made in the same size and weight since the 1860s, and the 8 reales was simply phased out.
The silver value of this one is $23.18.
So, you have close to $80 in silver. A shop buying them only for the silver would pay no more than $60. If they are uncirculated, they could be worth substantially more than the silver value, but it would take finding the right collector for each coin, as the same person might not want them all.
One other small point of interest: You will see that the silver weight and purity in the 5 peso coins dropped from 1947 to 1951, and by 1959, while the purity was the same as 1951, the weight had dropped again, and by a significant percentage. All while the face value of the coins remained the same. This is a classic example of the effect of inflation - the devaluing of a nation's currency.