To compare the numbers 0.0000635 and 0.000456, it's helpful to look at the values in a clearer format.
0.0000635 is equal to 63.5 × 10^-6, and 0.000456 is equal to 456 × 10^-6.
Since 63.5 is less than 456, we conclude:
0.0000635 < 0.000456
So, the answer is:
0.0000635 < 0.000456