Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 5/21 of 21/81?"
521 × 2181 is 581.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21×21/81 5/21×42/81 5/42×21/81 15/21×21/81 5/21×63/81 5/63×21/81 25/21×21/81 35/21×21/81
© everydaycalculation.com