Calculation don't return precise result (3.26x5000=16299.99999...)

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Posted on by Kimii

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Hi,
I am working with a table having a column displaying the results of the multiplication of 2 input values.

I want a result without the decimal part, so I tried to use RoundDown here:

RoundDown(TextInput1.Text*TextInput2.Text, 0)

It worked well until I came across some kind of numbers, and so confused that calculated results with them returned wrong.

Is it supposed that calculation in PowerApps is kind of different from what we had learned? (1.39x10=13.899999...)
Please help! And tell me if you know any about it

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Building Power Apps

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Manish Solanki 15,169 Moderator on at

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Hi @Kimii

To remove the decimal point from the result, use the below formula:
Value(First(Split(Text(TextInput1.Text*TextInput2.Text),".")).Value)

This will return a number. If you to it to return as string then use the below formula:
First(Split(Text(TextInput1.Text*TextInput2.Text),".")).Value

Please let me know if you face any problem & remember to give a 👍 and accept my solution as it will help others in the future.

Thanks
Kimii 134 on at

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@ManishSolanki Thanks for your reply. It worked for me!
may I ask why using Text() can make the wrong number (13899.99999...) change to
the right result (13900) as it must be?
Manish Solanki 15,169 Moderator on at

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Hi @Kimii

The variation of Round formula, works as:
Round rounds up if the next digit is decimal part is 5 or higher. Otherwise, this function rounds down.
RoundDown always rounds down to the previous lower number, towards zero.
RoundUp always rounds up to the next higher number, away from zero.
In my previous post, I have just removed the decimal part of the number without rounding off so if Result is 13899.99999 then it will just return 13899 and will not perform any mathematical round off operation. If you want to round off the result, you may try abovesaid different variations of Round formula.

Thanks
Kimii 134 on at

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@ManishSolanki
oh, I had actually believed that By picking up only the part standing before the decimal mark (.), if result is 13899.9999... then I'll get 13899.
But then I tried the way in your first post, then it returned 13900 😅 so I just try to ask you about how it can change in that way
MarcelLehmann 378 on at

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i wouldn't recommend you the split solution, cause if there is a ',' instead a '.'
-> somebody nobody knows, it will not work. i use split as a last solution if nothing work

normally you are correct and your function should work. (like the image)

Why the text function 'work' is, u just vonvert the value to a string -> split doesn't work with value.

IF the function like yours doesn't work, you could convert the value like, but as i said before it should normally work -> Text(RoundDown(TextInput1.Text*TextInput2.Text, 0),"0")
v-bofeng-msft Microsoft Employee on at

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Hi @Kimii ,

Floating-point arithmetic is approximate, so it can sometimes give unexpected results with many documented examples. You might expect the formula 55 / 100 * 100 to return exactly 55 and (55 / 100 * 100) - 55 to return exactly zero. However, the latter formula returns 7.1054 x 10^–15, which is very small but not zero. That tiny difference doesn't normally cause a problem, and the app rounds it away when showing the result. However, small differences can compound in subsequent calculations and appear to give the wrong answer.

I think this link will help you a lot:

https://learn.microsoft.com/en-us/power-platform/power-fx/data-types#number-and-currency

Best Regards,
Bof