4.2 as a Fraction

4.2 = ?
What is 4.2 as a fraction?

4.2 = 21/5.
4.2 as a fraction is 21/5.

This decimal to fraction conversion provides the detailed information on what is 4.2 as a fraction in simplest form and how it can be calculated.

Calculation: 4.2 in Fraction
4.2 = (?)
= (4.2/1) x (10/10)
= 42/10
= (21 x 2)/(5 x 2)
= 21/5
4.2 = 21/5
4.2 in fraction is 21/5

Step by step work for decimal 4.2 as a simplified fraction to understand the calculation.

step 1 Input values:
The decimal number = 4.2

What to be found:
What is 4.2 as a fraction in simplest form?

step 2 Write 4.2 as a simple fraction.
4.2/1

step 3 Find how many 10s should be multiplied with both numerator and denominator.
Since the decimal 4.2 has 1 digits after the decimal point, multiply 10 with both numerator and denominator of 4.2/1 to make numerator as a whole number.
(4.2 x 10)/(1 x 10) = 42/10

step 4 Rewrite the numerator and denominator of the fraction 42/10 in the form of multiplication factors as like the below.
= (21 x 2)/(5 x 2)

step 5 To simplify the fraction, check and cancel the factors of 42 and 10 if any factors in the numerator and denominator can be cancelled each other.
= (21 x 2)/(5 x 2)
42/10 = 21/5

Hence,
4.2 as a fraction is 21/5.