Convert the mixed repeating (recurring) decimal number 30.09. Turn it into a reduced (simplified) improper fraction, into a mixed number and write it as a percentage. Equivalent fractions calculator

Convert 30.09 into equivalent fractions and write it as a percentage value

1. Write the mixed repeating (recurring) decimal number as a percentage.

Approximate to the desired number of decimal places.

30.09 ≈ 30.1


Multiply the number by 100/100.

  • The value of the number does not change when multiplying by 100/100.
  • Note: 100/100 = 1

30.1 =

30.1 × 100/100 =

(30.1 × 100)/100 =

3,010/100 =

3,010%


  • In other words:
  • Approximate to the desired number of decimal places...
  • Multiply the number by 100...
  • ... And then add the percent sign, %
  • 30.09 ≈ 3,010%

» Convert fractions to percentages, online calculator


2. Write the mixed repeating (recurring) decimal number as an improper fraction.

  • 30.09 can be written as an improper fraction.

  • The numerator is larger than or equal to the denominator.

Set up the first equation.

  • Let y equal the decimal number:

  • y = 30.09


Set up the second equation.

  • Number of decimal places repeating: 1

  • Multiply both sides of the first equation by 101 = 10


y = 30.09

10 × y = 10 × 30.09

10 × y = 300.9

Get the same number of decimal places as for y:

10 × y = 300.99

Note: 300.99 = 300.9


Subtract the first equation from the second one.

  • Having the same number of decimal places ...
  • The repeating pattern drops off by subtracting the two equations.

10 × y - y = 300.99 - 30.09 ⇒

(10 - 1) × y = 300.99 - 30.09 ⇒

We now have a new equation:

9 × y = 270.9


Solve for y in the new equation.

9 × y = 270.9 ⇒

y = 270.9/9

Let the result written as a fraction.



Now we can write the number as a fraction.

According to our first equation:

y = 30.09

According to our calculations:

y = 270.9/9

⇒ 30.09 = 270.9/9


Get rid of the decimal places in the fraction above.

  • Multiply the top and the bottom number by 10.
  • 1 followed by as many 0-s as the number of digits after the decimal point.

30.09 = (270.9 × 10)/(9 × 10)

30.09 = 2,709/90


3. Reduce (simplify) the fraction above:
2,709/90
to the lowest terms, to its simplest equivalent form, irreducible.

To reduce a fraction to the lowest terms divide the numerator and denominator by their greatest (highest) common factor (divisor), GCF.


Factor the numerator and denominator (prime factorization).

2,709 = 32 × 7 × 43

90 = 2 × 32 × 5


» Prime factorization: break numbers down to prime factors, online calculator


Calculate the greatest (highest) common factor (divisor), GCF.

Multiply all the common prime factors by the lowest exponents.

GCF (32 × 7 × 43; 2 × 32 × 5) = 32


» Calculate the greatest (highest) common factor (divisor), GCF, online calculator


Divide both the numerator and the denominator by their GCF.

2,709/90 =

(32 × 7 × 43)/(2 × 32 × 5) =

((32 × 7 × 43) ÷ 32) / ((2 × 32 × 5) ÷ 32) =

(7 × 43)/(2 × 5) =

301/10


4. The fraction is an improper one, rewrite it as a mixed number (mixed fraction):

  • A mixed number = an integer number and a proper fraction, of the same sign.
  • Example 1: 2 1/5; Example 2: - 1 3/7.
  • A proper fraction = the numerator is smaller than the denominator.

301 ÷ 10 = 30, remainder = 1 ⇒

301 = 30 × 10 + 1 ⇒

301/10 =

(30 × 10 + 1) / 10 =

(30 × 10) / 10 + 1/10 =

30 + 1/10 =

30 1/10


301/10 ~ Equivalent fractions.

  • The above fraction cannot be reduced.
  • That is, it has the smallest possible numerator and denominator.

  • By expanding it we can build up equivalent fractions.

  • Multiply the numerator & the denominator by the same number.


Example 1. By expanding the fraction by 4.

301/10 = (301 × 4)/(10 × 4) = 1,204/40

Example 2. By expanding the fraction by 8.

301/10 = (301 × 8)/(10 × 8) = 2,408/80

  • Of course, the above fractions are reducing...
  • ... to the initial fraction: 301/10

» Reduce fractions and write them as decimal numbers and percentages


:: Final answer ::
Written in 4 different ways

As a reduced (simplified) positive improper fraction:
30.09 = 301/10

As a mixed number:
30.09 = 30 1/10

As a percentage:
30.09 = 3,010%

As equivalent fractions:
30.09 = 301/10 = 1,204/40 = 2,408/80

More operations of this kind

30.1 = ? Convert the pure repeating (recurring) decimal number 30.1. Turn it into a reduced (simplified) improper fraction, into a mixed number and write it as a percentage. Calculate other equivalent fractions to the decimal number, by expanding

Decimal numbers to fractions and percentages, calculator

Learn how to turn a decimal number into a fraction and a percentage. Steps.

1. How to write the number as a percentage:

  • Multiply the number by 100. Then add the percent sign, %.

2. How to write the number as a fraction:

  • Write down the number divided by 1, as a fraction.
  • Turn the top number into a whole number: multiply both the top and the bottom by the same number.
  • Reduce (simplify) the above fraction to the lowest terms, to its simplest equivalent form, irreducible. To reduce a fraction divide the numerator and the denominator by their greatest (highest) common factor (divisor), GCF.
  • If the fraction is an improper one, rewrite it as a mixed number (mixed fraction).
  • Calculate equivalent fractions. By expanding it we can build up equivalent fractions: multiply the numerator & the denominator by the same number.

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