Compare and sort the fractions in ascending order: - 17/31, - 18/34, - 28/19. Common ordinary fractions compared and sorted in ascending order, result explained below

Sort: - 17/31, - 18/34, - 28/19

To compare and sort multiple fractions, they should either have the same denominator or the same numerator.

The operation of sorting fractions in ascending order:
- 17/31, - 18/34, - 28/19

Analyze the fractions to be compared and ordered, by category:

1 negative improper fraction: - 28/19


negative proper fractions: - 17/31, - 18/34

How to compare and sort the fractions in ascending order, by categories:

- any negative improper fraction is smaller than...


- any negative proper fraction.



Sort the negative proper fractions in ascending order:
- 17/31 and - 18/34

Simplify the operation
Reduce (simplify) the fractions to their lowest terms equivalents:

- 17/31 is already reduced to the lowest terms.
The numerator and denominator have no common prime factors:
17 is a prime number.
31 is a prime number.


- 18/34 = - (2 × 32)/(2 × 17) = - ((2 × 32) ÷ 2)/((2 × 17) ÷ 2) = - 9/17




To compare and sort the fractions, build them up to the same numerator.

To build the fractions up to the same numerator we have to:

1) calculate their common numerator


2) then calculate the expanding number of each fraction


3) then build up their numerators the same by expanding the fractions to equivalent forms, which all have equal numerators

Calculate the common numerator

The common numerator is nothing else than the least common multiple (LCM) of the numerators of the fractions.


The LCM will be the common numerator of the compared fractions.


To calculate the LCM, we need the prime factorization of the numerators:


17 is a prime number.


9 = 32


Multiply all the unique prime factors: if there are repeating prime factors we only take them once, and only the ones having the highest exponent (the highest powers).


LCM (17, 9) = 32 × 17 = 153


External link > Calculate LCM, the least common multiple of numbers, online calculator


Calculate the expanding number of each fraction:

Divide the LCM by the numerator of each fraction.


- 17/31 : 153 ÷ 17 = (32 × 17) ÷ 17 = 9


- 9/17 : 153 ÷ 9 = (32 × 17) ÷ 32 = 17



Build up the fractions to the same common numerator:

Expand each fraction: multiply both its numerator and denominator by its corresponding expanding number, calculated at the step 2, above.


This way all the fractions will have the same numerator:


- 17/31 = - (9 × 17)/(9 × 31) = - 153/279


- 9/17 = - (17 × 9)/(17 × 17) = - 153/289



The fractions have the same numerator, compare their denominators.

The larger the denominator the larger the negative fraction.


The larger the denominator the smaller the positive fraction.


The fractions sorted in ascending order:
- 153/279 < - 153/289

The initial fractions sorted in ascending order:
- 17/31 < - 18/34


::: The operation of comparing fractions :::
The final answer:

Sort the negative proper fractions in ascending order:
- 17/31 < - 18/34

All the fractions sorted in ascending order:
- 28/19 < - 17/31 < - 18/34

How are the numbers being written on our website: comma ',' is used as a thousands separator; point '.' used as a decimal separator; numbers rounded off to max. 12 decimals (if the case). The set of the used symbols on our website: '/' the fraction bar; ÷ dividing; × multiplying; + plus (adding); - minus (subtracting); = equal; ≈ approximately equal.

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Tutoring: Comparing ordinary fractions

How to compare two fractions?

1. Fractions that have different signs:

2. A proper and an improper fraction:

3. Fractions that have both like numerators and denominators:

4. Fractions that have unlike (different) numerators but like (equal) denominators.

5. Fractions that have unlike (different) denominators but like (equal) numerators.

6. Fractions that have different denominators and numerators (unlike denominators and numerators).

More on ordinary (common) fractions / theory:

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


(2) Changing the form of fractions, by expanding or reducing (simplifying)


(3) How to reduce fractions (simplifying). The greatest common factor, GCF


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


(5) How to sort out fractions in ascending order


(6) Adding common (ordinary) fractions


(7) Subtracting common (ordinary) fractions


(8) Multiplying common (ordinary) fractions


(9) Fractions as rational numbers