21/6 to a mixed number

The fraction 21/6 as a mixed number is 3 1/2

Divide the numerator (21) by the denominator (6): the quotient 3 is the whole part and the remainder 3 is the numerator of the fractional part, over the same denominator. Reduced to lowest terms that gives 3 1/2.

Multiply the whole part by the denominator and add the remainder back: 3 × 6 = 18, and 18 + 3 = 21 — exactly the numerator you started with.

21 ÷ 6 = 3.5.