Why maths is called the queen of science?

Answer 1

Because of its importance in various other sciences.
Because science relys upon mathematics, physics is built upon mathematics, chemistry requires mathematics and some branches of Biology also.

Mathematics is "the language of the universe" when they sent messages into outer-space as an attempt to contact other intelligent life they sent mathematicical expressions and formulas because any intelligent life would develop a similar language to describe the universe and thus uncoding our message to them would be easier.

Mathematics has proofs, they compute outcomes and test the outcomes and they're correct.

Answer 2

Marcus du Sautoy has called mathematics 'the Queen of Science because it is the main driving force behind scientific discovery.