- 54/24 + 23/11 = ? Adding Ordinary (Simple, Common) Math Fractions Calculator, Addition Explained Step by Step

The executed operation (with ordinary fractions):
- 54/24 + 23/11

Result written: As a negative proper fraction (numerator < denominator). As a decimal number. As a percentage.

Reduce (simplify) fractions to their lowest terms equivalents:

To reduce a fraction: divide the numerator and denominator by their greatest common factor, GCF.

Fraction: - 54/24 = - (2 × 33)/(23 × 3) = - ((2 × 33) ÷ (2 × 3))/((23 × 3) ÷ (2 × 3)) = - 9/4;


Fraction: 23/11 already reduced to the lowest terms.
The numerator and the denominator have no common prime factors.
Their prime factorization:
23 is a prime number;
11 is a prime number;
gcf (23; 11) = 1;

Reduce (simplify) fractions to their simplest form, online calculator


Rewrite the equivalent simplified operation:

- 54/24 + 23/11 =


- 9/4 + 23/11

Rewrite the improper fractions:

Fraction: - 9/4


- 9 ÷ 4 = - 2 and remainder = - 1 => - 9 = - 2 × 4 - 1


- 9/4 = ( - 2 × 4 - 1)/4 = ( - 2 × 4)/4 - 1/4 = - 2 - 1/4;


Fraction: 23/11


23 ÷ 11 = 2 and remainder = 1 => 23 = 2 × 11 + 1


23/11 = (2 × 11 + 1)/11 = (2 × 11)/11 + 1/11 = 2 + 1/11;



Rewrite the equivalent simplified operation:

- 9/4 + 23/11 =


- 2 - 1/4 + 2 + 1/11 =


- 1/41/11

To operate fractions, build up their denominators the same.

Calculate LCM, the least common multiple of the denominators of the fractions:

LCM will be the common denominator of the fractions that we work with.

The prime factorization of the denominators:


4 = 22;


11 is a prime number;


Multiply all the unique prime factors, by the largest exponents:


LCM (4; 11) = 22 × 11 = 44


Calculate LCM, the least common multiple, online calculator


Calculate the expanding number of each fraction:

Divide LCM by the numerator of each fraction.


For fraction: - 1/4 is 44 ÷ 4 = (22 × 11) ÷ 22 = 11;


For fraction: 1/11 is 44 ÷ 11 = (22 × 11) ÷ 11 = 4;


Build up the fractions to the same denominator:

Expand each fraction - multiply the numerator and the denominator by the expanding number.


Then work with the numerators of the fractions.


- 1/4 + 1/11 =


- (11 × 1)/(11 × 4) + (4 × 1)/(4 × 11) =


- 11/44 + 4/44 =


( - 11 + 4)/44 =


- 7/44


Reduce (simplify) the fraction to its lowest terms equivalent:

To reduce a fraction: divide the numerator and denominator by their greatest common factor, GCF.

- 7/44 already reduced to the lowest terms.


The numerator and the denominator have no common prime factors.


Their prime factorization:


7 is a prime number;


44 = 22 × 11;


gcf (7; 22 × 11) = 1;


Reduce (simplify) fractions to their simplest form, online calculator


Rewrite the fraction

As a decimal number:

- 7/44 =


- 7 ÷ 44 ≈


- 0.159090909091 ≈


- 0.16

As a percentage:

- 0.159090909091 =


- 0.159090909091 × 100/100 =


( - 0.159090909091 × 100)/100 =


- 15.909090909091/100


- 15.909090909091% ≈


- 15.91%

>> Convert fractions to percentages, online calculator


The final answer:
:: written in three ways ::

As a negative proper fraction (numerator < denominator):
- 54/24 + 23/11 = - 7/44

As a decimal number:
- 54/24 + 23/11 ≈ - 0.16

As a percentage:
- 54/24 + 23/11 ≈ - 15.91%

More operations of this kind:

How to subtract the ordinary fractions:
- 65/31 - 33/19


Writing numbers: comma ',' used as a thousands separator; point '.' used as a decimal mark; numbers rounded to max. 12 decimals (whenever the case);

Symbols: / fraction bar; ÷ divide; × multiply; + plus; - minus; = equal; ≈ approximation;

Add ordinary fractions, online calculator

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How to: Adding ordinary (simple, common) math fractions. Steps.

There are two cases regarding the denominators when we add ordinary fractions:

  • A. the fractions have like denominators;
  • B. the fractions have unlike denominators.

A. How to add ordinary fractions that have like denominators?

  • Simply add the numerators of the fractions.
  • The denominator of the resulting fraction will be the common denominator of the fractions.
  • Reduce the resulting fraction.

An example of adding ordinary fractions that have like denominators, with explanations

  • 3/18 + 4/18 + 5/18 = (3 + 4 + 5)/18 = 12/18;

  • We simply added the numerators of the fractions: 3 + 4 + 5 = 12;
  • The denominator of the resulting fraction is: 18;
  • The resulting fraction is being reduced: 12/18 = (12 ÷ 6)/(18 ÷ 6) = 2/3.

  • How to reduce (simplify) the common fraction 12/18?

B. To add fractions with different denominators (unlike denominators), build up the fractions to the same denominator. How is it done?

  • 1. Reduce the fractions to the lowest terms (simplifying).

  • 2. Calculate the least common multiple, LCM, of all the fractions' new denominators:

    • LCM is going to be the common denominator of the added fractions.
    • Factor all the new denominators of the reduced fractions (run the prime factorization).
    • The least common multiple, LCM, is the product of all the unique prime factors of the denominators, taken by the largest exponents.
    • Calculate LCM, the least common multiple of numbers.

  • 3. Calculate each fraction's expanding number:

    • The expanding number is the non-zero number that will be used to multiply both the numerator and the denominator of each fraction, in order to build all the fractions up to the same common denominator.
    • Divide the least common multiple, LCM, calculated above, by each fraction's denominator, in order to calculate each fraction's expanding number.
  • 4. Expand each fraction:

    • Multiply each fraction's both numerator and denominator by expanding number.
    • At this point, fractions are built up to the same denominator.
  • 5. Add the fractions:

    • In order to add all the fractions simply add all the fractions' numerators.
    • The end fraction will have as a denominator the least common multiple, LCM, calculated above.
  • 6. Reduce the end fraction to the lowest terms, if needed.

... Read the rest of this article, here: How to add ordinary (common) fractions?

More on ordinary (common) math fractions theory:

(1) What is a fraction? Fractions types. How do they compare?


(2) Fractions changing form, expand and reduce (simplify) fractions


(3) Reducing fractions. The greatest common factor, GCF


(4) How to, comparing two fractions with unlike (different) numerators and denominators


(5) Sorting fractions in ascending order


(6) Adding ordinary (common, simple) fractions


(7) Subtracting ordinary (common, simple) fractions


(8) Multiplying ordinary (common, simple) fractions


(9) Fractions, theory: rational numbers