Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 8/20 of 40/81?"
820 × 4081 is 1681.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/20×40/81 8/20×80/81 8/40×40/81 24/20×40/81 8/60×40/81 40/20×40/81 56/20×40/81
© everydaycalculation.com