Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/81 of 25/42?"
2181 × 2542 is 25162.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/81×25/42 21/81×50/42 21/81×25/84 63/81×25/42 21/81×75/42
© everydaycalculation.com