calculation vs mathematics

calculation

noun
  • The act or process of calculating. 

  • Reckoning, estimate. 

  • The result of calculating. 

  • An expectation based on circumstances. 

  • The act or process of imagining sequences of potential moves and responses without actually moving the pieces. 

mathematics

noun
  • A person's ability to count, calculate, and use different systems of mathematics at differing levels. 

  • An abstract representational system studying numbers, shapes, structures, quantitative change and relationships between them. 

How often have the words calculation and mathematics occurred in a corpus of books? (source: Google Ngram Viewer )