Multiply by 11 Calculator

Learn More About Multiplying by 11

Multiplying by 11 is a common math trick that simplifies calculations, especially for 1 and 2 digit numbers. For a single-digit number, just repeat the digit (e.g., 3 x 11 = 33). For a two-digit number, imagine there's a space between the two digits. Add the two digits and place the sum in the space. For example, to multiply 23 by 11: Add 2 + 3 = 5. Place 5 between 2 and 3 to get 253. If the sum of the digits is 10 or more, carry-over the tens digit. For example, 57 x 11: 5 + 7 = 12. Place 2 in the middle and carry-over 1 to the first digit (5+1=6), resulting in 627. This tool helps you quickly calculate and visualize this trick.