Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 7/21 of 20/40?"
721 × 2040 is 16.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21×20/40 7/42×20/40 7/21×20/80 7/21×60/40 7/63×20/40 35/21×20/40 49/21×20/40
© everydaycalculation.com