Possibly, but not necessarily. You have chosen not to disclose the units of measurement which makes the whole question pretty pointless.
For example,
-10 deg C is colder than -6 deg C
but
-10 deg C is not colder than -6 deg F.
-6
-4
-6 is colder than -5
7
-30
What is 6 degrees colder than -3 degrees is
Yes, the lower the reading, the colder it is. And minus 8 is LOWER than minus 6.
The other way round because minus 10 is colder than minus 4
Twenty below (-20) is colder than ten below (-10).
-10F is colder than -3F
Minus 4 degrees Celsius is 10 degrees colder than plus 6 degrees Celsius. Or, it would be 24.8 degrees Fahrenheit.
Negative 56 degrees would be 50 degrees colder than negative 6 degrees.