not enough info
$1,300
Unless it's crisp and uncirculated, face value only
There were no series of 1951 $100 bills ever printed.
Bills printed in 1969 and later are only worth face value.
If you have four $100 bills, then the total value is $400. The only way a sequential set will have collector value is if they're an old series.
Check the date or rather series again. US dollar bills were not made in 2010.
Check the date or rather series again. US dollar bills were not made in 1960.
Check the date or rather series again. US dollar bills were not made in 1920.
The value depends on the series (date) and condition. If it's series 1976 or later, it's worth face value.
There were no series letters on 1929 bills, all of which were issued as National Currency bills. Please see the question "What is the value of a 1929 US 5 dollar bill?" for more information.
If you have four of them, then the set is worth $80.
What date? What series letter next to the date? What condition are they in? Please post a new question with more details.