Exaction of rows based on value using awk -

i have tab limited file this

gi nz 99.54 438 2   0   1   438 18559   18122   0.0  798   gi nz 99.77 438 1   0   1   438 1787    2224    0.0  804  gi nz 99.32 438 3   0   1   438 82769   83206   0.0  253  gi nz 100.00 438 0  0   1   438 19698   20135   0.0  809 

from above file want extract rows based on value of 3rd row (<100). how possible

desirable output

gi nz 99.54 438 2   0   1   438 18559   18122   0.0  798   gi nz 99.77 438 1   0   1   438 1787    2224    0.0  804  gi nz 99.32 438 3   0   1   438 82769   83206   0.0  253 

just this:

awk '$3<100' file