10-Marble

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convert from decimals to fractions

Forum|Forum|5 months ago
November 4, 2025
3 replies
672 views

Is there a function to convert from decimals to fractions?

Mathcad Usage

Best answer by Werner_E

@pannus0 wrote:

Is there a function to convert from decimals to fractions?

Not ready-made. You would have to program your own.

In real Mathcad (legacy Mathcad, versions 15 and below) there was a formatting option which would display a number with fractions but Prime does not offer this facility.

L

LucMeekes

23-Emerald IV

Try the symbolic keyword confrac.

Success!
Luc

P

pannus0

Author

10-Marble

I tried it as you suggested and I get:

L

LucMeekes

23-Emerald IV

That's correct, it means 0 + 1/2.

Did you read the manual? Add ",fraction" to confrac and see what happens.

Success!
Luc

W

Werner_E

Answer

25-Diamond I

@pannus0 wrote:

Is there a function to convert from decimals to fractions?

Not ready-made. You would have to program your own.

In real Mathcad (legacy Mathcad, versions 15 and below) there was a formatting option which would display a number with fractions but Prime does not offer this facility.

L

LucMeekes

23-Emerald IV

In real mathcad we had (have !):

and the functionality is available in Prime as well, according to the manual.

Luc

P

pannus0

Author

10-Marble

Something curious only happens with 0.25,0.25, but when they are numbers for example 0.375 this doesn't happen, any solution?

W

Werner_E

25-Diamond I

Here is a quick hack. The display is all but nice, though.

It should(may) work up to 12 decimals. Using a higher value for N increases the chance for round off errors when using "gcd".

We could determine the power of 10 needed to multiply the number to get an integer using strings. We might convert the absolute value of the fractional part into a string, delete the leading zero and the decimal point (if present) and the length of the string would correspond to the exponent of the power of 10 needed. Nonetheless the main problem still is the ugly display of the result.

In case you are not looking for mixed fractions you may also use the similar "test2".

While the display format as an 1x3 or 1x2 matrix sure isn't clear an nice, we have at least numerical results which could be used for further calculations (whatever they may be).

Of course we could convert the result into a string which makes for a slightly nicer look but could be used for display only.