cancel
Showing results for
Did you mean:
New Member

## RoundDown incorrect in certain instances

I found some very interesting RoundDown behavior and looking for some perspective here.

The initial number which sparked this was 17240.17. When entered into RoundDown(17240.17, 2) the result is 17240.16

This happens for .19, .26, and .35 as well. To add one final wrinkle this seems to happen only on whole numbers from 16384.17 and 20971.17

I appreciate any feedback on this. In the meantime I am using RoundDown(17240.17, 3) which seems to be working correctly

Thanks!

1 ACCEPTED SOLUTION

Accepted Solutions
Community Support

The point is Floating-point arithmetic is approximate, so it can sometimes give unexpected results with many documented examples. For example,you might expect the formula 55 / 100 * 100 to return exactly 55 and RoundUp((55 / 100 * 100) - 55,0) to return exactly zero. However, the latter formula returns 1.Because (55 / 100 * 100) - 55 returns  7.1054 x 10–15, which is very small but not zero.

Number and Currency

Best Regards,

Bof

Community Support

The point is Floating-point arithmetic is approximate, so it can sometimes give unexpected results with many documented examples. For example,you might expect the formula 55 / 100 * 100 to return exactly 55 and RoundUp((55 / 100 * 100) - 55,0) to return exactly zero. However, the latter formula returns 1.Because (55 / 100 * 100) - 55 returns  7.1054 x 10–15, which is very small but not zero.

Number and Currency

Best Regards,

Bof

Announcements

#### Community Blog

Stay up tp date on the latest blogs and activities in the community News & Announcements.

#### Power Apps Community Call- January

Mark your calendars and join us for the next Power Apps Community Call on January 20th, 8a PST

#### Global Power Platform Bootcamp

Dive into the Power Platform stack with hands-on sessions and labs, virtually delivered to you by experts and community leaders.

#### Power Platform Community Conference On Demand

Watch Nick Doelman's session from the 2020 Power Platform Community Conference on demand!

Top Solution Authors
Top Kudoed Authors
Users online (12,831)