Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 25/81 of 20/40?"
2581 × 2040 is 25162.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/81×20/40 25/81×20/80 75/81×20/40 25/81×60/40
© everydaycalculation.com