Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 15/81 of 15/80?"
1581 × 1580 is 5144.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/81×15/80 15/81×30/80 45/81×15/80 15/81×45/80 75/81×15/80 15/81×75/80
© everydaycalculation.com