Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 10/21 of 20/80?"
1021 × 2080 is 542.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/21×20/80 10/21×40/80 10/42×20/80 30/21×20/80 10/21×60/80 10/63×20/80 50/21×20/80 70/21×20/80
© everydaycalculation.com