How do you write 11/10 as a mixed number

The number becomes 1 and 1/10

Since when you multiply 1 x 10 = 10 + 1 = 11/10.

Equivalent fractions are fractions having the same value even if they look different. Look different means they may not have the same denominator or numerator but, when you multiply the top (numerator) and the bottom (denominator) by the same integer, the fraction keeps its value.  
 Equivalent fractions can be simplified and written as the same fraction for example, 18/27 = 6/9 = 2/3.  

If you would like to write 11/10 as a mixed number, you can do this using the following step:

11/10 = 1 1/10

Result: 11/10 equals to 1 1/10 as a mixed number.