Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/42 of 80/81?"
2142 × 8081 is 4081.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 21/84×80/81 63/42×80/81
© everydaycalculation.com