Arithmetic is the fundamental branch of mathematics that deals with numbers and numerical computation. Coursera's arithmetic catalogue teaches you the basics and complexities of numerical operations, number systems, fractions, decimals, percentages, and more. You'll learn to perform and understand the significance of addition, subtraction, multiplication, and division, gain an understanding of prime numbers, composite numbers, and factors, grasp the concept of ratios, proportions, and exponents, and apply these concepts to real-world problems. This skill lays the groundwork for further mathematical studies and plays an essential role in various fields, from finance to engineering.