When it says to estimate, I always think of doing it by hand to show work. So set it up like this:
96
x 34
So follow it out multiplying across 4*6 and 4*9 carrying over as needed to get it to look like this:
96
x 34
384
Do the same for the 3 to get this:
96
x 34
384
2880
Add 384+2880=3264
Your final answer is 3,264