算术

例句：

1. 1. Arithmetic is the study of numbers and their operations.
   算术是研究数字及其运算的学科。
2. 2.Mathematics is the branch of science that deals with numbers and shapes.
   数学是研究数字和形状的科学分支。
3. 3.In arithmetic, we add and subtract whole numbers to solve problems.
   在算术中，我们通过加法和减法处理整数来解决问题。