Arithmetical is an adjective that pertains to or is related to arithmetic. It refers to the fundamental operations of addition, subtraction, multiplication, and division, which are performed on numbers. However, if you are tasked to write, it's essential to add variety to your writing with synonyms for the word "arithmetical." Some of the synonyms for arithmetical include numerical, computational, mathematical, mathematical, and algebraic. Using these words interchangeably can help to enhance the richness of your writing and convey your ideas in a clear and concise way. So, use these synonyms to vary your sentences and make them more intriguing.