Home All Definitions Numbers & Symbols Truncating a Number Definition

Truncating a Number Definition

Truncating a number otherwise referred to just as truncation is a method of approximating a decimal number by dropping all decimal places past a certain point without rounding. In other terms truncation is limiting the number of digits right of the decimal point. For instance, with pi (π), 3.14159265…, it can be truncated down to 3.1415. In this case, if 3.14159265...were rounded to the same decimal place, the approximation would result in the number 3.1416.


An analogue of truncation can be applied to polynomials. In this case, the truncation of a polynomial P to degree n can be defined as the sum of all terms of P of degree n or less. For instance, Polynomial truncations arise in the study of Taylor polynomials.

Computer Science

With computers, truncation can occur when a decimal number is typecast as an integer. In this case the number getting typecast is truncated to zero decimal digits because integers cannot store non-integer real numbers.

Related Definitions


“Truncation.” Wikipedia, Wikimedia Foundation, 18 Dec. 2019, en.wikipedia.org/wiki/Truncation.



Check out our free app for iOS & Android.

For more information about our app visit here!

Add to Home Screen

Add Math Converse as app to your home screen.


Check out our free desktop application for macOS, Windows & Linux.

For more information about our desktop application visit here!

Browser Extension

Check out our free browser extension for Chrome, Firefox, Edge, Safari, & Opera.

For more information about our browser extension visit here!

Welcome to Math Converse



Cite This Page

QR Code

Take a photo of the qr code to share this page or to open it quickly on your phone: