Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 5/21 of 40/70?"
521 × 4070 is 20147.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21×40/70 5/21×80/70 5/42×40/70 15/21×40/70 5/63×40/70 25/21×40/70 35/21×40/70
© everydaycalculation.com