Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 18/21 of 18/81?"
1821 × 1881 is 421.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21×18/81 18/21×36/81 18/42×18/81 54/21×18/81 18/21×54/81 18/63×18/81 90/21×18/81 18/21×90/81
© everydaycalculation.com