Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 5/21 of 8/10?"
521 × 810 is 421.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21×8/10 5/21×16/10 5/42×8/10 5/21×8/20 15/21×8/10 5/21×24/10 5/63×8/10 5/21×8/30 25/21×8/10 5/21×40/10 5/21×8/50 35/21×8/10 5/21×56/10 5/21×8/70
© everydaycalculation.com