How to Add Two Numbers in Python

Last Updated : 19 May, 2026

Given two numbers, the task is to add them and display their sum. For Example:

Input: a = 5, b = 7
Output: 12

Let's explore different methods to add two numbers in Python.

Using + Operator

The + operator performs arithmetic addition between two numbers and returns their sum. It is commonly used to add numeric values directly.

Python 
a = 15
b = 12
res = a + b
print(res)

Output
27

Using sum() Function

The sum() function adds all values present in an iterable like a list or tuple and returns the total sum.

Python 
nums = [10, 5]
print(sum(nums))

Output
15

Using operator.add()

The operator module provides the add() function, which performs addition between two values similar to the + operator.

Python 
import operator
print(operator.add(10, 5))

Output
15

Explanation: operator.add() takes two numbers as arguments and returns their sum.

Using math.fsum()

The fsum() function from the math module is used for precise floating-point addition. It helps reduce rounding errors while adding decimal values.

Python 
import math
nums = [0.1, 0.2]
print(math.fsum(nums))

Output
0.30000000000000004

Explanation: math.fsum() accurately adds floating-point values present in the list.

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