There are 200 natural numbers
Question:

There are 200 natural numbers between 1002 and 1012.

Solution:

True

Natural numbers between $100^{2}$ and $101^{2}$

$=10 t^{2}-100^{2}-1 \quad[\because$ natural numbers between $a$ and $b=b-a-1]$

$=(101+100)(101-100)-1=201-1=200$