More....than

Is it really required to follow “more” with “than” ?

Mathematics is more challenging than Science.

Is it okay to write like this?

I liked Mathematics because it was more challenging.

Thanks

You have to provide the comparison somewhere, but it does not have to be by using ‘that’.
For example.
I likes science but I found that maths was more challenging.

how about this? I am not trying to compare as such

Business Mathematics requires good amount of intuition and trade-offs.

Any other word instead of “good”?

Business Mathematics requires a good amount of intuition and trade-offs.

I would say something like:
Business Mathematics requires a great deal of intuition and often involves some trade-offs.

Hi beesneees,

If I try to say in past tense, does this make sense?

I was impressed with Business Mathematics because it required (or requires?) a great deal of intuition and often involved some trade-offs.

One more thing. The above sentence doesn’t mean that I am not impressed with Business Mathematics anymore, right? I am just trying to recollect my past.

I was impressed by Business Mathematics because it required a great deal of intuition and often involved some trade-offs.
I became interested in’ would be a better opening than ‘I was impressed by’.