# Python Round Up to the Nearest Ten

This tutorial will discuss rounding a number to the nearest ten using Python’s `ceil()` function.

## Python Round Number to the Nearest Ten

Python has three built-in functions `round()`, `floor()`, and `ceil()` which can be used to round a number. The `ceil()` function belongs to the `math` module, and it is used to round a floating point number to the nearest integer greater than or equal to the given number.

If the significant digit of a floating point number is greater than zero, the number will be increased by one, and if the significant digit is equal to zero, the number will remain the same. For example, let’s use the `ceil()` function to round a floating point number.

See the code and output below.

``````from math import ceil

n = 2.1
print(ceil(n))
``````

Output:

``````3
``````

From the output, the number 2.1 is rounded to 3. The `ceil()` function can only round a floating point number.

If we want to round an integer to the nearest ten, like 31 to 40, we have to convert the number to a floating point first by dividing it by 10, and then we can pass it to the `ceil()` function and we can multiply the result with 10 to get the required number. For example, let’s convert a number to the nearest ten.

See the code and output below.

``````from math import ceil

x = 21
y = ceil(x/10)*10
print(y)
``````

Output:

``````30
``````

In the above code, the number 21 is rounded to 30. The `floor()` function of the `math` module is used to round the given floating point number to the nearest integer which is less than or equal to the given number.

For example, if we use the `floor()` function in the above code instead of the `ceil()` function, the result will be 20. The `round()` function is the mixture of the `floor()` and `ceil()` functions, and it rounds a floating point number to the nearest integer, which can be less than, greater than, or equal to the input number.

The function will start from the last significant digit of a floating point number; if it is greater than 5, the current significant digit will be dropped, and the digit before it will be increased by one number. And if the significant digit is less than or equal to 5, the significant digit before it will remain the same.

In other words, the `round()` function will act as the `ceil()` function. If the significant digit is greater than 5 and the digit is less than or equal to 5, it will act as the `floor()` function.

For example, let’s compare the result of all these functions using a single floating point number.

See the code and output below.

``````from math import ceil, floor

x = 21
y = ceil(x/10)*10
print(y)

y2 = floor(x/10)*10
print(y2)

y3 = round(x/10)*10
print(y3)
``````

Output:

``````30
20
20
``````

In the above code, we converted the given number to a floating point first and then passed it inside the functions, and then we multiplied the result by 10 to get the final result. Check this link for more details about the `ceil()` and `floor()` functions and the `math` module of Python.

Check this link for more details about the `round()` function.

Author: Ammar Ali

Hello! I am Ammar Ali, a programmer here to learn from experience, people, and docs, and create interesting and useful programming content. I mostly create content about Python, Matlab, and Microcontrollers like Arduino and PIC.