- 15 + 125/16 = ? Adding Ordinary (Simple, Common) Math Fractions Calculator, Addition Explained Step by Step

The executed operation (with ordinary fractions):
- 15 + 125/16

Reduce (simplify) fractions to their lowest terms equivalents:

Fraction: 125/16 already reduced to the lowest terms.
The numerator and the denominator have no common prime factors.
Their prime factorization:
125 = 53;
16 = 24;

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


Rewrite the expression:

As a negative improper fraction (numerator >= denominator):

- 15 + 125/16 =


( - 15 × 16)/16 + 125/16 =


( - 15 × 16 + 125)/16 =


- 115/16

As a mixed number (also called a mixed fraction):

Mixed number = a whole number and a proper fraction, of the same sign.


Proper fraction = numerator smaller than denominator.


- 115 ÷ 16 = - 7 and remainder = - 3 =>


- 115 = - 7 × 16 - 3 =>


- 115/16 =


( - 7 × 16 - 3)/16 =


( - 7 × 16)/16 - 3/16 =


- 7 - 3/16 =


- 7 3/16

As a decimal number:

- 7 - 3/16 =


- 7 - 3 ÷ 16 =


- 7.1875 ≈


- 7.19

As a percentage:

- 7.1875 =


- 7.1875 × 100/100 =


( - 7.1875 × 100)/100 =


- 718.75/100 =


- 718.75%

>> Convert fractions to percentages, online calculator


The final answer:
:: written in four ways ::

As a negative improper fraction (numerator >= denominator):
- 15 + 125/16 = - 115/16

As a mixed number (also called a mixed fraction):
- 15 + 125/16 = - 7 3/16

As a decimal number:
- 15 + 125/16 ≈ - 7.19

As a percentage:
- 15 + 125/16 = - 718.75%

How to add the ordinary fractions:
- 22/8 + 135/22

Writing numbers: comma ',' used as a thousands separator; point '.' used as a decimal mark;

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

Add ordinary fractions, online calculator

The latest added fractions

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?

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