Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 15/81 of 30/90?"
1581 × 3090 is 581.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/81×30/90 15/81×60/90 45/81×30/90 75/81×30/90
© everydaycalculation.com