Multiplication by 11, 111, 1111, and 11111 Calculator

Introduction

This interactive calculator visually demonstrates how to multiply any number by 11, 111, 1111, or 11111 using a simple yet powerful maths trick. It's designed for learners who want to see how this quick multiplication really works — step by step.

Enter any multiplicand (up to 10 digits) and enter a multiplier among 11, 111, 1111, or 11111. The moment you type, the tool instantly shows each intermediate step in a clear tabular format — no waiting or button clicks required.

How it works?

This quick trick follows a clear pattern:

• The calculation proceeds from right to left.
• Each step handles a group of digits from the multiplicand.
• The digits in the group are added, and carryovers are handled automatically.
• The number of steps = (digits in multiplicand) + (digits in multiplier) − 1.
• The group size increases and then decreases symmetrically during the process.

This lightning-fast tool helps students and enthusiasts understand why the trick works — not just get the answer. It's an excellent companion for learning a quick arithmetic trick and improving number sense.