Square of Two-Digit Number Ending in 0

How to Square a Two-Digit Number Ending in Zero

Squaring a two-digit number ending in zero is straightforward. Let\'s take an example, say 20. To find the square of 20, we multiply 20 by itself: 20 x 20.

A simple trick is to square the digit before the zero and then add two zeros at the end. For example, for 20:

• Square the digit '2': 2 x 2 = 4.
• Add two zeros to the end: 400.

So, 20 squared is 400. This tool helps you quickly calculate squares for numbers like 10, 20, 30, 40, 50, 60, 70, 80, and 90.

This method works because squaring a number ending in zero, say \(10 \times n\), is the same as \((10 \times n) \times (10 \times n) = 100 \times n^2\).