arithmetic

基础算术

Refers to the fundamental operations of addition, subtraction, multiplication, and division.

指加、减、乘、除等基本运算。

简单算术

Refers to easy or non-complex calculations.

指容易或不复杂的计算。

心算

The process of doing calculations in one's head without using a calculator or paper.

在头脑中进行的计算，无需写下来

做算术

To perform arithmetic calculations.

进行算术计算。