Like 17 probably.
12 straws
I need 100 straws.
8 straws.
6
18 straws.
6
12
15 straws are needed
6 straws are needed
Put many straws together to make it stronger
That's going to depend on what shape you're building, which, as far as I can see, you neglected to mention.
If the straw were normal and 8.25 inches then it would take 4.772121212121212... straws.