Look at the pattern:
12, 30, 56, 90, 132, \ ?
Find the differences:
30-12=18
56-30=26
90-56=34
132-90=42
Now observe the differences:
18, 26, 34, 42
They increase by (8) each time.
So the next difference is:
42+8=50
Add this to 132:
132+50=182
So, the next number is:
=182